Re: MAF Mess

[Rex Weatherford <rex.weatherford@mentisys.com>]

Bill Shaw wrote:
> 
> I'm having a lean misfire problem on my '87 Camaro V6,  sometimes stalls at idle,
> misfires severely at anything more than 1/3 throttle. No trouble codes or SES.
> My first guess was an injector problem,  but trying to troubleshoot it today I
> pulled the MAF connector while it was idling.  It stalled and when re-started lit
> SES and gave a MAF error code. After that it ran much better with  no misfire but
> the SES was on steady.  A few hours later I started it,  SES was out and the
> misfire was back.
> 
> That says to me it's a sensor problem,  not an injector problem. Does it mean
> it's the MAF?   Will the ECU ignore ALL the sensors while running with the SES
> on,  or just the one that set the error code?  Is there a way to test the MAF to
> see if it's working properly?
> 
> Thanks,
> 
> Bill
> 


I would first check to make sure that there are no intake leaks from the
MAF sensor to the Head.  Any type of leak can cause the sensor reading
to be out of range and set a code.

I have read that bad TPS and dirty MAF's can also cause this.

Rex Weatherford
92 Beretta GTZ 2.3l Speed Density (No MAFs)
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