Technical Tips > Post 84

Please help with my C4 before I go insane!

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Vettech:
It may explain the code 33 or 34. If all else is STD can I ask why is it removed. If when cold you apply foot to peddle to get it started then this will draw more air and set a code 33. If you don't, it may detect low air and set 34. Once set they stay till a hard reset. Battery on pad is low - by for now

Vettech:
Oh - be fore this shuts me off - even though these codes are set, they should not effect the drive ability of the car. 33/34 are only detected in first ~30 sec upon start up. 36 is the MAF burn off - the actual burn off is activated if the car is run for "X" time and then stopped. Relay supplies 12v to the hot wire and heats for "x" seconds to burn off any grim / residue stuck to the wire. This wire is hot whilst running and its temperature is related to its resistance thus more air cools it - more air needs more fuel, computer reads resistance and varies the fuel accordingly.

Ausrs:
re reading the thread it appears that most electrical bits have been replaced,Is this a lhd or a converted rhd car ? if its a converted car maybe its time to look at some of the wiring

It may be fuel injected but it still only needs air fuel and spark to work ....just more wires than a carby car and a few more sensors.

I had a no start issue with my car that had me stumped for a while (original lhd still),pulled my hair out until I found the broken wire that didn't let current run through to injectors
 
I also had a new memcal made that installed a tune from an 89 model that deletes the cold start and I had the egr system programed out ...makes the electronics a little simpler 

Vettech:
Very interesting! I'm testing my memory here, but didn't GM change to sequential injection in 88, I suppose it would not make much difference, instead of injecting all odds then all evens, it would do each individually. Give better power + econ, but by 88 they all had all Alloy Heads and roller rockers. My black book only goes to 90 and I'm now having self doubt. Umm maybe SHE is right - dementia setting in.........

Jethro:

--- Quote from: Jethro on April 21, 2015, 05:54:36 PM ---Come on Glenn you have a Beaut C4 and it's hopefully not that big a fix just need to get it to someone that knows what they are talking bout.... :thumb:

--- End quote ---

Come on Glenn bite the bullet son ! Ring Steve at S.R.Perforance.... :thumb:

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