Best engine mechanic in karachi

engnr.mubashir (engnr.mubashir) 2020-06-25 21:11:35 +0500 #1

Is there any luch I can find good mechanic these days I have searched past post regarding my query but couldn't find any good answer they. So kindly tell mein where to go for engine related issue.

RehanBhatti (RehanBhatti) 2020-06-26 00:07:57 +0500 #2

What is the issue with your car bro?

engnr.mubashir (engnr.mubashir) 2020-06-26 00:23:45 +0500 #3

Car is jerking in sencond gear @1000 rpm and 3rd gear @1500 amd 4rth gear @ 1500 to 2000. Today gor it check feom mechanic and said throttle body has some worn our butter fly shaft that he got it repaired from market and has got the TPS and butterfly changed but I think he haven't changed it. Also spark plug gap was set and even swapped the spark plugs with new and he also checked spark lead they were also ok.

RehanBhatti (RehanBhatti) 2020-06-26 00:47:45 +0500 #4

Worn out throttle blade creat rough idle issue usually. Did you check your TPS resistance check procedure by digital multimeter?
What about spark plug cables resistance? It should not be more than 6k ohm per feet. And check ignition coil resistance too.

engnr.mubashir (engnr.mubashir) 2020-06-26 01:43:15 +0500 #5

Ok will check the spark plug lead resistance and TPS tomorrow.

engnr.mubashir (engnr.mubashir) 2020-06-26 15:50:16 +0500 #6

A to C TPS resistance

B to C TPS resistance

B to C TPS resistance @ WOT

Ignition coil resistance

RehanBhatti (RehanBhatti) 2020-06-26 17:21:17 +0500 #8

Your coil secondary resistance is fine and TPS resistance seems ok too. What about coil's primary resistance( it should be 0.86-1.06 ohm)? And what about spark plug cables resistance( should be 3.0-6.7 kilo ohms per feet)?

engnr.mubashir (engnr.mubashir) 2020-06-26 19:02:44 +0500 #9

How to check primary resistance of coil.

engnr.mubashir (engnr.mubashir) 2020-06-26 19:04:48 +0500 #10

Spark plug leads resistance.

RehanBhatti (RehanBhatti) 2020-06-26 19:29:01 +0500 #11

Check resistance on coil's both supply point. That is primary resistance

RehanBhatti (RehanBhatti) 2020-06-26 19:30:39 +0500 #12

Now measure each wire length in feet and devide it on its respective resistance.

engnr.mubashir (engnr.mubashir) 2020-06-26 19:53:31 +0500 #13

Bro I checked on both supply points of coil reading was same on both.

RehanBhatti (RehanBhatti) 2020-06-26 20:07:38 +0500 #14

Primary resistace should not be more than 1.06 Ohm. If it is then your coil is bad.
I hope you are checking coil resistance according to below pic

ali.7861 (Ali Haider) 2020-06-27 02:20:16 +0500 #15

I faced the similar problem in my Cultus jerks because of a worn out clutch cable....

engnr.mubashir (engnr.mubashir) 2020-06-27 23:06:56 +0500 #16

My bad bro. Actually I didn't checked the primary coil resistance in that way will measure once get back to my home.