Service engine soon light

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Oct 2, 2018 | 01:45 PM

mwk777

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Heel & Toe

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Service engine soon light

I have a 1990 convertible that has developed a service engine soon light issue. I have changed out the distributor, checked the timing and put all new spark plugs in it but it still has hesitation and poor acceleration and an intermittent service engine soon light that comes on. Any ideas on what to check next?

Oct 2, 2018 | 02:49 PM

JimLentz

Melting Slicks

Joined: Jan 2014

Posts: 2,478

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From: Downers Grove Illinois

Check for codes as outlined here.

Oct 3, 2018 | 03:33 PM

aklim

Team Owner

Joined: Jul 2004

Posts: 28,463

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From: Hartford WI

Quote:

Originally Posted by mwk777

Check the fuel pressure, spark plug wires and scan the data from the ECM

Oct 3, 2018 | 05:29 PM

xrav22

Drifting

Joined: Mar 2013

Posts: 1,952

Likes: 239

From: Venice Cali.

After taking out my distributor I did not put the ICM wires all the way back on the module. It causes misfire and melted one of my wires and thru a code . check your codes for the first step

Oct 3, 2018 | 05:57 PM

65Z01

Team Owner

Joined: Dec 2000

Posts: 90,675

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From: SE NY

Cruise-In II Veteran

I agree with pulling the codes as the next (should be first) step.

Oct 4, 2018 | 04:32 PM

mwk777

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Quote:

Originally Posted by 65Z01

I agree with pulling the codes as the next (should be first) step.

thanks for the help! Just got home and disconnected the battery and then restarted the car. The light came back on and I did the code check and came up with h43. “Electronic spark control” any ideas on this. Already Changed plugs wires and distributor

Oct 4, 2018 | 06:40 PM

bosshog8

Pro

Joined: Apr 2008

Posts: 502

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From: Pine Barrens New Jersey

It appears to be knock sensor related.

Attached Images

1990 CORVETTE 1 SERVICE MANUAL.pdf (282.9 KB, 102 views)

Oct 4, 2018 | 06:45 PM

mwk777

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Joined: Sep 2014

Posts: 24

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Quote:

Originally Posted by bosshog8

It appears to be knock sensor related.

funny you say that, initially it had the code for knock sensor and electronic spark. Now at idle so far only electronic spark is showing up. You think it worth just to replace the knock sensor?

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Oct 4, 2018 | 06:49 PM

mwk777

Thread Starter

Heel & Toe

Joined: Sep 2014

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Quote:

Originally Posted by mwk777

funny you say that, initially it had the code for knock sensor and electronic spark. Now at idle so far only electronic spark is showing up. You think it worth just to replace the knock sensor?

the chart is awesome but a little above my abilities