C4 Tech/Performance L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine

codes 34 and 36, 88 Vette

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Old Aug 22, 2004 | 03:53 PM
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Default codes 34 and 36, 88 Vette

Got a 88 Vette and has always pulled a 34 and 36 code every since I have got this car. I have changed the MAF sensor and changed the two relays that are associated with the MAF sensor. A while back I took car too Chev. dealership and they told us they could not communicate with the ECM. Went to local parts store and bought an ECM and did not change nothing. Still pulled codes. I need some advice of what to do and maybe look for? Thanks
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Old Aug 22, 2004 | 04:16 PM
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Go through the trouble shooting charts in your Helms (link)manual. Otherwise, after you throw many hundreds of dollars at it, you will likely stumble over the 50 cent problem. Unfortunately, I have no antidotal information. No MAF.

RACE ON!!!
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Old Aug 22, 2004 | 06:55 PM
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Originally Posted by angecarl
Got a 88 Vette and has always pulled a 34 and 36 code every since I have got this car. I have changed the MAF sensor and changed the two relays that are associated with the MAF sensor. A while back I took car too Chev. dealership and they told us they could not communicate with the ECM. Went to local parts store and bought an ECM and did not change nothing. Still pulled codes. I need some advice of what to do and maybe look for? Thanks
Are you getting codes right after start up or after some driving time

Codes at start up, for me at least, was bad IAC

Codes after running for a while were the MAF relays

I would suggest that you find or buy an ez link or other scanner so that you can not only read the codes but also read the info being sent to and from the ECM.

That's how I zeroed in on the IAC, counts were way off

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Old Aug 22, 2004 | 07:17 PM
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Does the car have an aftermarket chip? My car had a Hypertech at one time and some scan tools cant comunicate with it. Try a stock chip if you can.
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Old Aug 23, 2004 | 11:31 AM
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Just tried to help another member with code 34, I'm betting on carbon buildup in the throttle body.At least the general found it to be such a common problem on 1985-87 they posted a service bulletin.
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Old Aug 23, 2004 | 12:49 PM
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This is the thread Rick is referring to:

http://forums.corvetteforum.com/showthread.php?t=889866
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Old Aug 23, 2004 | 02:32 PM
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Yes, but he came back and said he had cleaned the TB, and I asked if he cleaned the IAC and housing, since this can also cause the same type of problems.
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Old Aug 23, 2004 | 05:17 PM
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Originally Posted by rick lambert
Yes, but he came back and said he had cleaned the TB, and I asked if he cleaned the IAC and housing, since this can also cause the same type of problems.
Just put injectors back in and cleaned the TB, plenum, and runners. Also the IAC that is under the TB is brand new!
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