Hyundai Santro Little White Smoke and Fuel Smell in Exhaust

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adeel.ch.46 (Adeel Matloob) 2021-03-17 01:31:16 +0500 #1

I have Hyundai Santro 2007 Club variant. I recently bought it. Car is throwing little white smoke on high throttle and fuel smell from the exhaust. Average is very low its like around 10km in the city. I have recently changed the mobile oil and spark plugs but the smoke has just appeared 3 to 4 days ago. Valuable experience is required to resolve this issue.

Hassan1991 (Electrical Engineer ) 2021-03-17 02:17:05 +0500 #2

You have to scan it first. Fuel smell is a sign of rich mixture.

adeel.ch.46 (Adeel Matloob) 2021-03-17 21:49:44 +0500 #3

Sure i will get it scanned. Probably there is high rate of fuel injection. Unfortunately the guy with the scanner doesn't allow to see the results so can you please tell me that what is the ideal fuel injection rate and fuel to air ratio for santro engine ??

Hassan1991 (Electrical Engineer ) 2021-03-17 22:05:21 +0500 #4

Scanner will not show AFR. It will display fuel trims. Fuel trims can tell you how ecu is dealing with fuel also injectors duty cycle at idle.

adeel.ch.46 (Adeel Matloob) 2021-03-17 23:40:53 +0500 #5

Ok then please share the trim values which i should look for. How much values there should be which are considered as ideal??

Hassan1991 (Electrical Engineer ) 2021-03-18 00:26:55 +0500 #6

Ideal values of both short term fuel trim and long term fuel trim are close to zero. But in real world that should be between -25 to +25 (that's the end limit before warning)

adeel.ch.46 (Adeel Matloob) 2021-03-20 16:49:12 +0500 #7

Got my car checked electrically. Everything was fine. They cleaned the joints and rechecked the wiring. Everything was fine except thre thing that plugs were contaminated with black oil layers. Please guide what could be the reason as electrician told to check it from mechanic. Three plugs were contaminated with black sooth oil. One was clear and fine.

Hassan1991 (Electrical Engineer ) 2021-03-20 16:54:12 +0500 #8

that's a bad sign. Get compression tested. It will let you know if rings and valves seals are worn out or not.

adeel.ch.46 (Adeel Matloob) 2021-03-20 20:42:56 +0500 #9

Compression test will be done by auto electrician or car mechanic??

adeel.ch.46 (Adeel Matloob) 2021-03-20 21:16:25 +0500 #10

Hassan1991 (Electrical Engineer ) 2021-03-20 22:14:20 +0500 #11

Mechanic.
That seems like bad piston rings.

adeel.ch.46 (Adeel Matloob) 2021-03-21 01:42:32 +0500 #12

Is compression test enough to finalize that its piston ring issue??

Hassan1991 (Electrical Engineer ) 2021-03-21 01:45:40 +0500 #13

yes. Wet and dry test. let's you know that only valve seals are bad or rings as well.

adeel.ch.46 (Adeel Matloob) 2021-03-21 12:49:32 +0500 #14

Bundle of thanks brother. Today i will go for the test and will update you later on.

Hassan1991 (Electrical Engineer ) 2021-03-21 12:53:59 +0500 #15

No need .
Yes sure.

adeel.ch.46 (Adeel Matloob) 2021-03-21 16:30:49 +0500 #16

Got my car checked from 2 mechanics. Both said no need of compression test. Engine overhaul is the solution. Please suggest me from where should i get the engine overhauled?? Lahore, Multan or Rawalpindi keeping in the price of spare parts and labour charges.

Hassan1991 (Electrical Engineer ) 2021-03-21 16:43:17 +0500 #17

Mention from which city you are?

adeel.ch.46 (Adeel Matloob) 2021-03-22 12:28:00 +0500 #18

I am from multan basically

Hassan1991 (Electrical Engineer ) 2021-03-22 17:15:58 +0500 #19

In Isb you can contact @dani_kk

adeel.ch.46 (Adeel Matloob) 2021-03-22 18:25:12 +0500 #20

Sure i will conract him. What if i get engine overhauled in multan or lahore?? Which city would you suggest?