Technical Tips > Electrical-Electronics-Air-Lighting-Guages-Security-Vacuum
87 Runs like a dog.
69VETTE:
Sounds awesome, and yes they do have a memory ... I was told that too, mines a 1990 Vette.
MY081:
Amate of mine who doesnt use the forum just rang and said he had that very same prob . He says its the mas air flow senser he said if you like you can ring him on 0409724442 to talk to him his name is Greg .
Jethro:
Hmmm, I think I have a New Adjustable MAF Sensor laying somewhere I bought for my 1988 C4 but never used..... P.M me know if your interested ?
Jethro
Vettech:
Thanks everyone - Whilst trying to sleep I had an appithany (where's the spell checker) last night and thought it may also be the ESC - Electronic Spark Control unit, but this would normally set a Code 43 - So before any more I'm off to work to download all codes - if no 43 then I will ring Greg.
More than likely your Greg is on the money since Codes 33, 34 and 36 are all MAF related issues. I've checked the associated relays and their contactor resistances and they check OK. But my gut still tells me that detonation, back fires etc upon acceleration are a function of timing, vac advance etc. So I will pack up and off to Minto to see what codes I now have - I'll try and refrain from taking the 1 gallon can of petrol with me.
Regards,
Vettech. :grr:
77CVT:
If you can find someone with an 87 you could swap MAF to confirm? Apparently 85-87 are different MAF's but I have swapped (briefly) with no issues.
Here is a rare example of something that can happen (to me) with similar symptoms - my earth cable was moving an intermittently touching the exhaust. Probably not your issue but worth checking.
Disconnect your battery for 5 mins and take it for a run. If you only have the MAF related codes see if you can swap it with a working one.
I cannot see the point of a learning mode. All that data is hard programmed into the chip. It will only change if you buy the software and flash a new one.
oh, and check the knock sensor wire on the rhs of the block. Sometimes mine comes loose and cause issues.
Good luck. :cheers:
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