165 MAF troubles

[Michael Davis]

MAF sounds ok at idle..

Check your O2...  Sounds like deja-vu all over again.. 8-)

Have you put a scanner on it?

mike

In message <Pine.SOL.4.02.9910121544140.20617-100000 at gate.engin.umich.edu>,Dani
el Joseph Kunnath II writes:
>
>	Hey all,
>
>
>	This is the lowdown on what I need help with.  My Bosch hot-wire
>MAF for an 89 L98 Camaro is acting up.  Well really, the engine is acting
>up and I suspected the MAF was the culprit.  Where I really have trouble
>is during cold start-up.  The engine will stall and I can't get it to idel
>properly.  I adjusted the TPS and replaced the IAC valve, but that didn't
>do the trick.  I then took my old voltmeter to the MAF and checked it out.
>When the harness is unplugged out of the MAF and the ignition is on, I get
>12V from the power relay (correct) and I get 5V from the MAF sensor input
>(correct).  The kicker is when I plug the harness into the MAF.  After I
>power up the MAF, I measure 2.2V at both the computer and the MAF.  When
>the engine is idling with the MAF connected, I get 0.4V at idle (correct),
>but the thing pegs out at near 2.2V @ 4500rpm.  According to everything
>I've ever seen, engine off ignition on should be 5V and engine on should
>go from about 0.4V at idle to near 5V at WOT.  With the low redline of the
>TPI engines, I'd imagine that I should be pulling near 5V @ 4500-5000rpm.  
>
>	The engine will run with the MAF connected, and it idles steady
>even during the old broomstick test.  I can't figure out where the problem
>lies...could it by the sensor grounds?  I can't find enough information on
>the insides of this MAF to dig into it.  I don't want to spend the ~$400
>for a new one either if I can help it.  I'd like to swap another in to see
>what happens, so possibly would one of you who are doing the MAF->MAP swap
>like to get rid of your working MAFs?  
>
>	Any insight is appreciated.  I've had this problem ongoing for
>weeks now and I want to get it resolved.  I got to get back out on the
>road!
>
>	Thanks,
>
>	DK
>
>