stalls when hot

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38SHO

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so I got code 189 and 191 previously, but they haven't showed up now.

pretty much anytime I drive my car for more then 10 minutes it starts to act up.

it bogs HORRIBLY, it will stall if you let it idle, if you try to give it gas in nuetral is reluctantly will rev and aronud 3k or so it will pop and make some noises from the exhaust I know aren't normal.

fuel pressure was at 8psi KOEO, 30psi KOER, I'm wondering if the KOEO reading was off somehow, as with the engine running it was producing pressure within spec.

changed fuel filter

cleaned MAF and Filter

vacuum line to FPR looks good, I don't HEAR any vacuum leaks, and it seems really odd that a vacuum leak would be intermittent. BUT one time, I drove my car for like 10 minutes down the interstate, it was running rough, and the air was blowing full blast out the defroster when I had the EATC set otherwise. now that sounds like a vacuum leak problem..... I was going to look at it when I got to her house, but I started it up, and it was perfect and running normal.... wierd shit

PLEASE HELP!!!

when its cold it runs like a champ, has power, no idling issues or bogging, no stalling.........

-------------edit---------------------- forgot to add---------------

I have a Snapon MT2500 scanner.

I got into the data section today when it was acting up. MAF voltage was in spec for idle, TPS looked good, ECT was @ 200 degrees, o2 sensors were changing erratically, I hear this is normal. I forgot what the value they read is, maybe its mV? I don't know TOO much when it comes to engine parameters. They were switching between numbers like 70, 380, 700....... then I noticed something odd..... it was just idling and I hear it start to sputter and start acting up like it does.. and BOTH o2 sensors are holding steady at a value of 7. Maybe that can help, maybe those readings are correct and attributed to whats going wrong with the fuel system. I find it odd both o2 sensors would go out at the same exact time.
 
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your fuel pressure is way too low,also i think you may have bad O2's.
IIRC fuel pressure should be around 40PSI.
does your pump make strange noises when is primes?
are you running a aftermarket MAF?
 

38SHO

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stock MAF, fuel pump sounds normal, ALLDATA says the spec for fuel pressure with Enging running is 30-35psi..

I think spec for engine off is 35-37psi........
 

38SHO

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not the slightest bit

however my oil light does come on when it stumbles real low like below 400rpm's... could be normal tho
 

SuperchargedSHOguy

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SHOtime2511 said:
your fuel pressure is way too low,also i think you may have bad O2's.
IIRC fuel pressure should be around 40PSI.
does your pump make strange noises when is primes?
are you running a aftermarket MAF?

O2's were a month old before I sold the car to Todd. FP should be higher. Do you have another stock MAF to swap in? Some of your symptoms sound like what happens if you try to throw in say an 80mm MAF without the use of some sort of tuner- car runs fine for a little while and then will not idle at a stop. Perhaps the MAF is on its way out.
 
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38SHO

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yeah I hear you about the aftermarket MAF's........


hmmm Im just somewhat suprised I don't have a MAF code if this is the problem tho.....

I know of 1 ATX sho that was at the junkyard in TERRIBLE condition, maybe I'll go check her out

I'll also get a price quote on a new one monday
 

SuperchargedSHOguy

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I don't know if you get up this way much, but Jason and I have a few spare MAFs. Also it may be a great time to replace the fuel pump with a 190 if you plan to run the juice soon.

I had the MAF die on my 91+ and it did not throw a code. Replaced it and it was good as new.
 
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SuperchargedSHOguy said:
O2's were a month old before I sold the car to Todd. FP should be higher. Do you have another stock MAF to swap in? Some of your symptoms sound like what happens if you try to throw in say an 80mm MAF without the use of some sort of tuner- car runs fine for a little while and then will not idle at a stop. Perhaps the MAF is on its way out.
yup this does sound MAF related,they like to make the car lean out when they start to go,check your plugs and see what kinda of shape there in.
 

38SHO

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yeah I'll change my fuel pump for the zex,

also changing the sparkplugs to something else
 

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