well my maro didnt have any problems for quite a while so i guess something new was just about to come up, so here's the problem. My car starts out fine when i start it for the first time, but if i drive around for a bit, and turn my car off, i have a problem of restarting it unless i wait untill its cooled off. what happens is that it turns and turns and turns, and when it finally starts it displays an MAF code.

now i have a spare MAF, and chaning them doesnt affect the problem.

any ideas ?

( 88 camaro 2.8 MPFI 5 spd. )

 

Do you have an aftermarket chip? Have you changed the maf relays?

 

yeah, look into the maf burn off relay...i had problems with this and went through 2 maf before the problem was found...this costs 15 bucks opposed to 200 so, check it out...

 

88,

Which MAF error code is being stored? I'd suspect these members are right and you may have a burn-off cycle problem. Thsi may have nothing to do wioth the MAF sensor itself. I've even seen the auxilliary (fuel pump) oil pressure switch cause MAF burnoff cycle problems.

 

thanks for the replies,
i've already replaced the relay and the sensor to no avail.
vader tell me more about the oil pressure sensor causing problems, because i was having a problem with my oil pressure unit when it wont display the correct oil pressure untill the car warmed up.
it remains spiked up at 550 kpa (the highest on the gauge for you US people, because i dont know the quvivalent in psi ) untill warms up, then it drops to around 250 kpa at idle ( about halfway up the gauge), unless i increase the rpm.

thanks
andy

 

I'm on my second MAF in 3 months and my car is doing the big Yellow light on the dash again, (and trouble starting) I need to look into that MAF relay too.
biker

 

So, back to my first question - which error code are you getting? (There are three codes for MAF problems.)

 

i keep getting code 34.
now another something peculiar i noticed, last tiem i did a tune-up to my maro and checked the codes, the fan came on while hte ecm was displaying the codes, it doesnt seem to do it anymore.

 

The fan is supposed to come on...that's strange that it doesn't. You haven't changed the chip?

 

nope , i swapped ecm's though with the spare one i have. didn't seem to solve the problem.

 

just in case i hadnt mentioned it before the spare ecm/ MAF sensor/ burnoff relay came off the same kind of car as mine, same year , same drivetrain, even the same colour

 

I wonder if your fans will come on at all now. Try grounding the wire going to the sensor in your passenger side head between the first two plugs with the key in accessory mode and see if the fans come on. If the ecm didn't fix it, there's got to be a wiring problem somewhere..besides the MAF problem

 

which wire is that ? i looked around and i couldn't find it ...
ill take out the electrical diagram tomorrow and i'll look for it around there.

vader, anything at all you might suggest ?

 

Start by checking the TPS voltage. A high TPS setting will make the ECM expect more intake air (higher MAF signal).

Inspect the intake ductwork for poor connections, cracks, and splits in the ductwork. Any leakage will contribute to a lower MAF reading.

Also check the PCV system. If the breather tube is leaking or not connected correctly, the MAF signal will be low. You cannot use a breather type oil fill cap with a MAF system - the crankcase must be sealed and drawing its vent air from the intake ducts.

Test the voltage at the MAF connector. If the sensor is not getting a 5.0VDC supply on terminals A and C, the signal will be lower. This could be the result of poor connections or grounds.

If I am correct, your V-6 has an FM MAF and therefore only one relay. You can still test the signal on the B terminal if you have a scope, but short of that an output voltage reading will be inconclusive.

 

thanks for hte replies everyone, im currently swamped with homework, school stuff, and work, so i wont be able to actually do anything to the car up untill after the final exams for this semester.

i'll keep you posted on what i find afterwards though

thanks again