car runs like crap when mass ir plugged in

I think it could very well indicate a MAF problem... at startup your car doesn't go into closed loop rigth away. If he gets a good idle /w no maf before it warms up and it idles like poo /w the maf then I would clean or replace the MAF befor anything else.

I may have missunderstood though, is this a problem that only occurs after the car warms up?

COULD is the important word there.
When the computer doesn't see a MAF input signal it changes strategy. Regardless of OL/CL.

The described condition does not exclusively point to the MAF meter.


jason
 
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If you still have the original maf plug it in and see if the problem is better. Those things are extremely touchy. I had a chip burned for my setup and it wouldn't idle at all until I changed the tube in the maf, didnt think a 24 to a 19 tube would matter that much but it does. Also remove the diablo chip and see what that does.
 
maf problems

i recently purchased a slightly used gt40 crate engine and it came with 30# injectors and matching maf...and my idle is all over the place sometimes not all the time sometimes it holds steady but when it starts surging up and down i can pull the plug to the maf and it levels out......the mechanic said that the maf wasnt reading right ,but any info would be appreicated its only at idle it runs great while driving especially WOT......any help would be appreciated....also i have a hypertech chip in my computer and the other guy didnt have one could that be the problem?
 
Pull the codes from the ecu
Yank the chip and see how it runs. If the problem persists, then pull the codes again.

Disconnecting the MAF tells you little. Your mechanic should know that...
All that happens when the MAF is unplugged, is the ecu jumps a 'limp' strategy.


Pull the codes and see what you get...

jason