Check Engine - Team Camaro Tech
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post #1 of 7 (permalink) Old Jun 21st, 02, 09:59 AM Thread Starter
Join Date: Jun 2002
Location: Chico
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Ok last week I replaced my distributor cap,rotar and plugs and adjusted my timing. Ever since then my check engine light comes on and my oil pressure drops, my idle goes down to about 5 and feels like its going to die, then everythings fine once I step on the gas, the problem is only when I idle. The engine codes were 42 and 44 (O2 sensor and ignition control module) I replaced both and still have the problem. Please Help. Oh Its a 85 Z28 305 TPI Thanks
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post #2 of 7 (permalink) Old Jun 21st, 02, 10:47 AM
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I am NO expert on comp. controlled cars, but it sounds like a timing problem. I know you said you adjusted it, but it sounds like you may need to mess with a little more. You will get more replies on this from people who can help more than me, but I thought I would give it a shot. Good luck.
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post #3 of 7 (permalink) Old Jun 21st, 02, 10:52 AM
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I meant to ask this in my reply, have you checked for any new codes since you replaced the module and o2 sensor?
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post #4 of 7 (permalink) Old Jun 21st, 02, 10:59 AM
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Join Date: May 2001
Location: Houston, Texas
Posts: 4,491

How did you set your timing?

Did you follow the instructions on the underhood decal?

It's also possible the new module is bad.
Is it a GM part?

Don~ ZZ430DropTop
70 RS/Z28
67 RS/SS Convertible, 70 RS/Z28
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post #5 of 7 (permalink) Old Jun 23rd, 02, 12:46 PM Thread Starter
Join Date: Jun 2002
Location: Chico
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Yes I did check the engine codes after I replaced the sensors, and the code for the O2 sensor keeps coming up. I got the control module From a Chevy dealer her In town so hopefully he gave me the right one. I did the timing with a timing light, but I am really not sure If it correct I will try it again. Thank you for all your help if you think of anything else please let me know.
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post #6 of 7 (permalink) Old Jun 23rd, 02, 02:17 PM
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Join Date: Jan 2001
Location: conway s.c.
Posts: 168
Greetings JDZ28,
I have some information from a 1989 camaro dealer service manual concerning trouble codes 42 & 44 for a vin "F" 5.0 tpi engine. If you are interested, I could e-mail it to you. The code 42 is for the electronic spark timing (EST) circuit & code 44 is for the O2 sensor circuit (lean exhaust indicated).
Hope this helps you a little!!!!!!!!!!!!!!!

The Trickster!!!!!!!!!!!!!!!!!!!!!!!
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post #7 of 7 (permalink) Old Jun 24th, 02, 02:03 AM
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Location: Kingsland, Georgia
Posts: 326
JDZ28, If you disconected the EST bypass wire when you set the timing which is the correct way to set the timing the ECM WILL SET a "check engine" light and code 42. This is normal. You have to disconnect the battery when your done setting the timing to clear this code.
As for code 44 - lean exhaust is another problem. Was the car acting up before you did a tune-up?
Here are some possibles for a lean exhaust condition: coolant temperature sensor out of range, vacuum leak, fuel pressure too low, could also relate to the ECM (injector drivers or prom going bad). Could be the ground wire for the sensors/ECM located on the engine. I've seen this and it can cause gauges to go crazy.
Do you have access to a scanner like a TECH 1?
Another thought is the mass air flow sensor going bad.
You did disconnect the black/tan tracer wire when you set the timing, right ???
69, It's not just a number, it's a way of life !

[This message has been edited by drew69 (edited 06-24-2002).]

[This message has been edited by drew69 (edited 06-24-2002).]
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