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Discussion Starter · #1 ·
My car is a project car first. The car ran fine when I parked it about a month ago. Now I start it and it will surge badly and then shut off, runs rich, and will not accelerate quickly, slow steady acceleration until about 3k then pops and sounds like it is missing. Changed FP regulator and no luck. I bought this car as a work in progress, ran fine before parking, quite a few mods.:confused:

Already cleaned IAC, checked TPS, not sure of correct readings (mine ranges from 1.2+/- to 4.6+/- ohms with key off, TPS unplugged) not sure if MAP sensor can be checked.
 

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try cleaning your MAF and wd40 your cap and rotor
 

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If the TPS voltage is at 1.2v like you say. Then thats too high. Needs to be between .6v and 1.19v to not throw a code and cause any drivability symptoms.
 

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How do you know if the voltage is correct going to the ECM with no power to the sensor?

Test should be done with with the Key on engine off, and TPS hooked up.

Tp properly test the MAP/BP sensor, you would need to use a DVOM that has a hertz reading capability.

First off, you need to check the codes from the ECM.
 

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Discussion Starter · #6 ·
What do you use to retrieve codes? Car has been butchered a little, not sure what is still hooked up. Will I get misleading codes?
 

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You pierce the black and green wires, probe them with a digital voltmeter and check it with the key on engine off. At closed throttle, it should be between .6 and .99 volt and not go over 5.0 volt at wide open throttle. If at anytime the voltage drops to zero, there's a problem with it.

Checking your mass air meter would be a good idea.

89coupe can tell you how to check the codes without a code reader.
 

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Discussion Starter · #8 ·
TPS voltage is now .901 at min throttle, 4.687 at full throttle. Still have the same problem. I don't know what to check next, I am confused at the fact the car ran great when I parked it.
 

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It could be corrosion on the mass air element. Get some brake cleaner, take the mass air meter off the car, and then lightly spray the element inside the meter housing. The brake cleaner leaves no residue behind, and be careful when spraying the element because it's fragile and can be easily broken. Let the element dry completely then reinstall the meter and see if it helps.

TPS voltage sounds fine.
 

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Discussion Starter · #10 ·
Yes I have cleaned the mass air flow sensor, the only issue I see with it is that the top of the sensor is cracked. Right next to the plug, (plastic portion)is it possible for the inside to be damaged or is it hermetically sealed?
 

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Done the test, codes 31, 67 and 85 come up. Tried to clear, but would not. Still the same problem.
Did you try to run the codes while the engine was running? If not you need to. Make sure the A/C is turned off if you have it.

Bad gas is a possiblilty.
 

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Discussion Starter · #16 ·
Adding new gas is on my list, I may add some race fuel to it since there is about a half tank already there. The other problem is that I cannot run the code test while running because it will not run at an idle long enough, as of now I get no response from the throttle.
 

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Discussion Starter · #18 ·
Unhooking it made it shut off. The gas is another option I will try later, I wouldn't think that it could be a problem because it is only been in there about a month or so also, possibility though, the place I got the gas from is in question for having watery gas (who would of guessed!) Just getting tired of fuel injection problems, too many things to act ghostly in a moments notice.
 

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Help

I just bought a car dats been sittin for awhile. It will crank and run but want take gas the longer it run the more gas I can give it. But it cuts off its been sittin 4 a year are more. So where do I need to start to get it going
 
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