Daewoo fan club

[Shah73]

@testdriver:

my problem of petrol average is not resolved since i bought the car. Its true that distrubutor is kept advaced for CNG but if distributed is reversed for petrol driving then it should help improve the petrol average, but it does;nt.

There is no any white or black smoke, no petrol leakage, CO reading is checked many times (if you mention it again then i will recheck it, i think it was around 2-3). I feel as 13L petrol Petrol is consumed in just 70km around in city. is there any other thing to be checked.

Otehrwise engine functioning is smooth and fine. I got the sensors checked twice but all fine. Sound engine, Bosch 4tip plugs, fine plug leads, i also changed the petrol gauge (new one) to remove my suspicion about petrol reading but......
Is there any other thing about petrol reading gauge to be checked.

Is it workable to give direct current to petrol gauge to verify its reading.

What do you say about petrol related technical issue and Petrol gauge.
This is the only thing i could not resolved as yet related to my car.

Waiting for your response.

[SalarsCar]

@Lonely_Puma

In my opinion, 100 km (if its a 55 cylinder) is not that bad in city traffic. However, it depends that how hard u r on ur accelerator, how often u use AC and from where u get ur cylinder filled when u got 148km/100km milages. Setting on the basis of CO levels works for gasoline but may vary for CNG, especially these days bcause quality of gas supplied is highly unreliable. Sometimes u get a gas whose octane no matches the tuned distributor vis-a-vis cylinder's octane requirement and sometimes u r surprised by the gas of lower octane value. So in my opinion u should observe ur car's average with more details noted.

Secondly, if high RPM is due to a faulty sensor, it should be normally an intermittent issue with most probably giving SES yellow indication as well. But if its always high RPM on idle (as seems to me) its not bcause of a sensor .In my opinion best method to adjust RPM is as follows:-

a) Remove Air cleaner
b) Start engine on patrol
c) Rotate the screw on TBI clockwise & anticlockwise to listen distinct whistling sounds of two different frequencies
d) Adjust the screw in between two whistling points.
e) Place air cleaner & then set RPM on CNG through CNG kit only.

[SalarsCar]

@shah73

I think that even if distributor is retarded to petrol setting, there shall not be a considerable difference on consumption until the blocked air cleaner intake is opened. Actually we block it to 90% in order to adjust MAP/vacuum for CNG. Whereas, when engine runs on petrol, the air-fuel mixture is composed of more than 70% air especially on higher speeds. Therefore, if the air cleaner is kept blocked while engine running on petrol, its just like "engine da galla kutna". It will definitely consume more fuel than normal. Its my theory and I may be wrong. Plz do correct me if its so

[SalarsCar]

@testdriver
@omeranwar
@shah73 and
@thanda

I m really amazed to see the interest that every body has shown in making this dream a reality i.e. building our own "PC based scan/tune tool" . @testdriver's efforts r really commendable. @thanda thanx for the links u suggested, they were quite informative and u seems 2 b a nice surfer:).

Anyways, up till now some of my concepts have been clarified but some got confused. Let me share my understanding step by step & plz correct me if I m wrong.

I always thought that OBD is an OS for ECM, like Windows is for PC. And ALDL is data port of ECM like serial/RS-232 is com port of a PC.

The reason due to which the two data ports (ALDL of ECM & serial port of PC) simply donot communicate through cross cables is the difference in voltage levels or impedance matching kind of issues.

So manufacturer of scantools design the application software / OS of their scan tool compatible with either OBD1, OBD2 or CANbus etc and their device becomes a generic OBDx scantool.

Whereas, manufacturers of cars provide the data cartridge to customers in order to fit in "a generic scantool" in their cars without experiencing level matching issues.

If this is the case than ECM of Daewoo Racer (i.e. pre-1994) should have complied the software standard of OBD1 (may be with minor variations) and must talk to sofwares like winALDL. (I came to know about this software through the link mentioned by @thanda, I downloaded and installed & found very interesting)

Similarly, the data cartridge issue must be resolved by designing a level matching cct as tried by @testdriver. An effort made by MAFAK on Making Aldl Cable To Connect PC To OBD1 Ecu might also work.

Comments awaited!

ALLAH NIGHEBAN

[testdriver]

@shah73

I think that even if distributor is retarded to petrol setting, there shall not be a considerable difference on consumption until the blocked air cleaner intake is opened. Actually we block it to 90% in order to adjust MAP/vacuum for CNG. Whereas, when engine runs on petrol, the air-fuel mixture is composed of more than 70% air especially on higher speeds. Therefore, if the air cleaner is kept blocked while engine running on petrol, its just like "engine da galla kutna". It will definitely consume more fuel than normal. Its my theory and I may be wrong. Plz do correct me if its so

Blocking the intake causes an increase in vacuum in intake manifold, thus modifying the MAP readings and as a result more fuel is supplied (rich A/F). To get a perfect petrol setting, do the following:
(1) Remove Air Blockage
(2) Remove Ventury [if installed]/CNG injector & close the hole in the throttle body too if installed Spray some injector cleaner into the IAC valve and set the ignition to 'ON' and then 'OFF' several times so that the valve is closed and opened several times causing the liquid to clean the valve from inside out.
(4) To be on safe side, get the fuel tank cleaned, get the pump checked & replace if required and also get the fuel filter checked & replace if needed.
(4) Reset the ECM by removing the fuse/negative battery terminal for at-least 1 minute.
(5) After installing the fuse back, switch the ignition to 'ON' and set the CO initially to 2.8V. Start the engine, keep it running for 5 minutes and then check for any missing/bad idling. If there is some sort of missing with low RPMs, increase the CO until the RPMs are stable.
(6) Short the pin-A with the pin-B of the ALDL connector as is done like reading codes, but this time without shutting down the engine. This will put the ECM in diagnostic mode. Now adjust the distributor to a point where the engine is stable and with jerky throttle there is no knocking. This is the ideal point of spark timing for petrol. Now adjust the idle screw as described by you above.
(7) Now remove the temporary wire off the pin-A and pin-B. Your engine is ready to be run properly on petrol.
(8) The only thing which is left is the self learning mode of ECM and for that you have to drive your car constantly for at-least 30 minutes as per your taste, since ECM will adjust itself according to your driving style.

Once you have achieved the optimum setting for the petrol, you can put back the CNG accessories and now don't let any mechanic fiddle with the petrol setting ever :).

[testdriver]

@testdriver
@omeranwar
@shah73 and
@thanda

I m really amazed to see the interest that every body has shown in making this dream a reality i.e. building our own "PC based scan/tune tool" . @testdriver's efforts r really commendable. @thanda thanx for the links u suggested, they were quite informative and u seems 2 b a nice surfer:).

Anyways, up till now some of my concepts have been clarified but some got confused. Let me share my understanding step by step & plz correct me if I m wrong.

I always thought that OBD is an OS for ECM, like Windows is for PC. And ALDL is data port of ECM like serial/RS-232 is com port of a PC.

The reason due to which the two data ports (ALDL of ECM & serial port of PC) simply donot communicate through cross cables is the difference in voltage levels or impedance matching kind of issues.

So manufacturer of scantools design the application software / OS of their scan tool compatible with either OBD1, OBD2 or CANbus etc and their device becomes a generic OBDx scantool.

Whereas, manufacturers of cars provide the data cartridge to customers in order to fit in "a generic scantool" in their cars without experiencing level matching issues.

If this is the case than ECM of Daewoo Racer (i.e. pre-1994) should have complied the software standard of OBD1 (may be with minor variations) and must talk to sofwares like winALDL. (I came to know about this software through the link mentioned by @thanda, I downloaded and installed & found very interesting)

Similarly, the data cartridge issue must be resolved by designing a level matching cct as tried by @testdriver. An effort made by MAFAK on Making Aldl Cable To Connect PC To OBD1 Ecu might also work.

Comments awaited!

ALLAH NIGHEBAN

The problem is neither the voltage nor the current, but it is the clock speeds that matter. The clock speeds of serial port much match to the attached device to communicate (baud rate). I have tested the signals (1's[~2.5v] and 0's [~0.8v]) by attaching a OVM meter to the wire connecting to the pin 2 of the serial port (receiving pin of the serial port). There are various baud rates for the various GM ALDL ports:
A. Unidirectional (80,100,160)
B. Bidirectional (8192,9600)

The purpose of using MAX232 chip is to cater for the needs of serial port baud rates, and the circuit I have built is working fine. We only need a matching software for that.

So far I have tested the following software:

1. Scantool net 1.1.3
2. Wieners scantool
3. WinALDL 1.09
4. PCM COMM
5. ALDL Monitor 1.05
6. ECM 852
7. Orion Tuner
8. STEC (open source)
9. PCMSCAN 1.4.3 & 1.5
10. ProScan 4.0
11. ScanTool GM Code 22
12. ScanMaster 1.1

I even got the generic GM ROM files (150+) and their compiler, but these were intended for at-least 2.0 L onwards, and Daewoo/Opel/Vauxhaul were not mentioned against the files, and hit and trial for such a huge list is not an easy task :(.

[Lonely_Puma]

@SalarsCar,

Thank you very much for the explanation. The cylinder's 55Kg and I'm filling up from Shell F-7. I believe there has been some intermittent AC usage too. But when you say '... rotate the screw on the TBI ...' do you mean the screw mentioned in the diagram below at #20 (idle air adjustment screw)? Also I was just curious as the manual says that the Idle RPM is automatically controlled on fuel injected models 1.4 and 1.6 only the CO (air fuel mixture) can be controlled, so I guess our model is different then?

@Testdriver,

Thank you so much for sharing with us. Me being a beginner wanted to confirm my understanding of a few things:

1) From the above diagram (from the manual) - Is IAC Valve is the one at #18? (Idle air stepper motor)
2) As you mentioned adjust the distributor to the point where engine is stable, could you please elaborate a little on how that can be done? Like I mean does it need to be rotated or there's some screw?

[testdriver]

@Lonely_Puma

1. Off-course #18 is IAC valve (which is basically a stepper motor operated valve)
2. Adjust means rotate.

[Lonely_Puma]

@Lonely_Puma

1. Off-course #18 is IAC valve (which is basically a stepper motor operated valve)
2. Adjust means rotate.

Great! Thanks. I'll report my results soon.

[Uashah007]

Can any one tell me about tires size which is suitable for woo.i am using 205-60-R13.

[thanda]

hello friends
the on going project seemed to be getting some heat
@salar
yes am quite good at finding things over google

@testdriver
to make car's ecm and pc talk each other we need an FPGA xpert and a software developer, there are a total of 88 fault codes i guess i dont think so thats its gonna be a problem for a developer to make program in this regard, the program may not be look like a professional program bt it will do the job!!

I have found some other stuff over net and i guess this is wat we r looking for

GM diagnostic obd 1 trouble codes reader

daewoo is mentioned as "potiac lemans 1982-93"

[testdriver]

hello friends
the on going project seemed to be getting some heat
@salar
yes am quite good at finding things over google

@testdriver
to make car's ecm and pc talk each other we need an FPGA xpert and a software developer, there are a total of 88 fault codes i guess i dont think so thats its gonna be a problem for a developer to make program in this regard, the program may not be look like a professional program bt it will do the job!!

I have found some other stuff over net and i guess this is wat we r looking for

GM diagnostic obd 1 trouble codes reader

daewoo is mentioned as "potiac lemans 1982-93"

Our main aim is to analyze live data from sensors, the codes reader in the above mentioned link will just display the stored codes. For live data, we have to develop:
1. Communication hardware
2. Data reading software

The first point, the communication hardware, has already been developed and working. We need the second part, the data reading software. For that matter we should have prior knowledge of control and data signals. Once we know the signals, then we can develop a software that can read data from serial port and further setup a mechanism to refresh the data every second.

So the base point of our software will be analysis of control and data signals. For every data signal, we to first send a control command to the ECM to provide us e.g. data from the data register containing information about Throttle Position Sensor[TPS] (0X3F8: 0X2) which will recognize the command and will return the control command to read the signal followed by the data signals for TPS. Likewise we will get the data one by one from the ECM for every sensor if we know the control command/signal of a particular sensor.

I am a software developer myself and have developed several hardware interfacing projects using C/C++ and VB6. In case you are interested in developing a software (PC based solution), you wouldn't need FPGA expert, since we are not interested in manufacturing a standalone scanners in our case.

[testdriver]

@Uashah007

As per the user manual the recommended tire specs are 175/70R13T for SOHC and 185/60R14H for DOHC engined vehicle.

[SalarsCar]

@Lonely_Puma

As u narrated
"Also I was just curious as the manual says that the Idle RPM is automatically controlled on fuel injected models 1.4 and 1.6 only the CO (air fuel mixture) can be controlled, so I guess our model is different then?"

Dont u think that we our selves have modified the TBI assembly to make it a "different" model?

Offcourse we did, we added up the CNG injector in TBI assembly and choked the air intake from air cleaner assembly, without altering the pre-fed data of actuators' values in ECM. So idle RPM setting on CNG is trickier. See how:-

a) Assume filling ur cylinder from any where after crossing salt range e.g. Faisalabad
b) Offcourse its a low quality gas (low on octane value)
c) And u donot adjust the CNG intake to TBI accordingly
d) While in city traffic u feel hampered acceleration especially with AC 'on', AC trips or ur engine shuts off when u apply clutch
e) U take car to a normal mechanic
f) He would only increase the RPM from this screw # 20 if he is not aware of the fact that its because of the change in quality of gas
g) So no matter what ever the way ECM learns the scenario, it would not b able to set idle RPM through IAC valve. And u will experience unexpected high idle RPM with AC 'off'.

So in my opinion a trade off setting from this screw might be necessary in order to carryout manual idle air intake adjustment through throttle butterfly, over and above the auto adjustments from ECM.

[Uashah007]

thanks alot for your kind opinion bro.whats the consequences of fixing spacers in car.my car rear tires touches mud guards while crossing bump and having two persons at back.there is no cng kit.

Secondly how hids work in woo, cos im planning to install it

[tauxeef]

@testdriver
bro can you plz send me the serial data gathered from the ecm?
does it send data continuously on serial port? or u have to trigger any pin for that?

[guybwp]

can any body tell me how to increase mileage on CNG?

[testdriver]

@testdriver
bro can you plz send me the serial data gathered from the ecm?
does it send data continuously on serial port? or u have to trigger any pin for that?

Switching the ignition ON did send some bits for few seconds but I didn't have any program to read raw data from the serial port and log it, but I just tested for existence of data only by using AVOM. I forgot to mention that I did the trial three years ago and then left due to lack of time as I became busy in office projects. I think I have to collect the things again to restart the project

[Jiggerz]

Assalam-0-Alaikum Everyone

I'm new to this forum and here are some of the pics of my Daewoo Racer

[tauxeef]

Assalam-0-Alaikum Everyone

I'm new to this forum and here are some of the pics of my Daewoo Racer

[img]https://www.pakwheels.com/forums/attachment.php?attachmentid=230922[/img]

Loved it nice colour...