5.0 monster computer problems

1218 Views 8 Replies 4 Participants Last post by wbrockstar, Oct 23, 2018

pjjensen23

Discussion Starter · Oct 17, 2018

So I'm have some real hesitation and power loss from my 95 5.0 oh. I can't tell it's definitely a computer issue. Everything turns up good with all the new senors. But I suspect the tfi on the passenger fender is going out. When I finally got the specialty tool to unbolt it. I had it tested, and it checked out good. But while trying to find the tfi, I ended up redoing my timing. And it worked as good as new. For all of about 3 days. Now it's doing it worse. And it's not out of time. I assumed it was just out of time but I'm suspecting the tfi. I need some serious help I've been trying to fix this problem for months now.

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145566

· #2 · Oct 17, 2018

I don’t believe it would start if the tfi were bad.
Plugs n wires new I assume?

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145566

· #3 · Oct 17, 2018

MAF new? Engine coolant temp sensor new? Iat new? Maybe it’s seeing something new it doesn’t like and is pulling timing.
Or is it fuel pressure related?
It’s mega hard to diagnose via the web. Too many things cause the same symptoms.

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pjjensen23

Discussion Starter · #4 · Oct 17, 2018

90lxwhite said:
MAF new? Engine coolant temp sensor new? Iat new? Maybe it’s seeing something new it doesn’t like and is pulling timing.
Or is it fuel pressure related?
It’s mega hard to diagnose via the web. Too many things cause the same symptoms.

Yes. Has new map, new o2 sensor, tps, distributor, wires, plugs. What's lat? And I think something is pulling timing. Fuel pressure seems good.
The only reason I think it's the tfi is because when I took it off and had it tested. We tested it 3 times and each time it tested good. I bolt it back on and it runs good as new. 3 days later. It starts spitting and sputtering under any sort of load.

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145566

· #5 · Oct 17, 2018 (Edited)

pjjensen23 said:
90lxwhite said:

MAF new? Engine coolant temp sensor new? Iat new? Maybe it’s seeing something new it doesn’t like and is pulling timing.
Or is it fuel pressure related?
It’s mega hard to diagnose via the web. Too many things cause the same symptoms.

Click to expand...

Yes. Has new map, new o2 sensor, tps, distributor, wires, plugs. What's lat? And I think something is pulling timing. Fuel pressure seems good.
The only reason I think it's the tfi is because when I took it off and had it tested. We tested it 3 times and each time it tested good. I bolt it back on and it runs good as new. 3 days later. It starts spitting and sputtering under any sort of load.

IAT- intake air temperature sensor. It’s located in the pipe/tube between the filter and throttle body. I’m 98%.6 it’s not the tfi. With a bad tf you’d be driving and the car would die. Also, it tested good three times.. You have something intermittent and the tfi is coincidence.
You tried to pull codes and got nothing?

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145566

· #6 · Oct 18, 2018

The engine coolant temperature sensor is pretty important also.
https://dannysengineportal.com/engine-coolant-temperature-sensor-ect/

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wbrockstar

· #7 · Oct 19, 2018

The tfi was more of a common problem on the 86-93 models because it would develop heat soak issues because of being mounted to the distributor.Once it was relocated to another part of the vehicle,the failure rate went way down.
The ect can be tested by disconnecting its wiring harness and placing multimeter leads across the sensor terminals with the meter set to read ohms.Test it cold then warm the engine up for 10-15 minutes and test it warm.The values should match the chart below for a given temp.

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berniemac73

· #8 · Oct 21, 2018

Fuel pump, pressure regulator, if dizzy is new doesnt mean it didnt fry again. Ecm is usually easy to tell if it is bad. Open it see if capacitors are toast.

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wbrockstar

· #9 · Oct 23, 2018

Have you tried pulling codes yet to see if any are present?? All you need is a short piece of wire to make a jumper out of and your mil.The mil will flash the codes (if any)If no codes are present, youll get a code 111 (system passed code) Codes might be present since you're having the type of symptoms you are.In the diagram at the bottom,connect the jumper wire just like shown in the lower left column then turn the key on to activate the code tests.Make sure the engine is at operating temp,the ac is off,the trans is in neutral (5 speed) park (auto) and the clutch pedal is down (if 5 speed) The following link explains where to connect the jumper wire to and how to run the tests.
DIY KOEO/KOER/Cylinder Balance Self-Test Procedure

Do you ever experience any hard starts/long crank times whether the engine is cold or hot?? Do the symptoms occur at any engine temp or only when the engine is hot??

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5.0 monster computer problems

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