5.0 mustang low RPM miss
I have a 1990 5.0 Mustang that has developed a high-load, low-RPM miss. The miss is most noticable at WOT below 2000 RPM and goes away with increasing RPM. My guess is that it is ignition related. I have replaced the plugs, wires, distributor cap, rotor, coil, and the TFI module with no success. It has slowly gotten worse over time.
Any suggestions would be appreciated. Thanks, Jeff |
Re: 5.0 mustang low RPM miss
This is a tech question and should be moved to the Windsor Power forum.
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Re: 5.0 mustang low RPM miss
No problemo. :D
Mebbe you're leaning out. Is it just when the engine is at operating temperature, or all the time? Have you tested the MAF sensor? |
Re: 5.0 mustang low RPM miss
The miss appears to be independent of engine temperature. The mass airflow sensor was replaced a couple of years ago. It's the most noticable in 5th gear.
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Re: 5.0 mustang low RPM miss
Sounds like timing. What's it set at right now?
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Re: 5.0 mustang low RPM miss
Any mods?
If you have aftermarket rockers, adjustment could be out, you could be losing compression? just a guess. Also, sounds ignition related, but it could be a weak fuel pump, you need to be sure your getting fuel pressure. And that you dont have a defected coil, even if it's new. Check engine grounds, and see if you can run a code scanner, and pull codes. could be a number of things, clean the maf, i dont care if it's new, and make sure all injectors are squirting. good luck.. |
Re: 5.0 mustang low RPM miss
Is it an audible misfire (backfire?) Does it clear itself out after a few pops?
Either one of those scenarios sound you could have a broken or failing fuel injector. |
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