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-   -   94 mustang gt rough idle (http://www.allfordmustangs.com/forums/5-0l-talk/613825-94-mustang-gt-rough-idle.html)

Ms29402 01-02-2014 08:53 PM

94 mustang gt rough idle
 
Hello, I am new to this forum stuff so don't be harsh. So anyway I need help, I have a 1994 mustang gt. It has a rough rough idle like it is going to stall (sometimes does) and it's really bothering me. My CEL comes on periodically. I have codes koeo 334 then continuous memory 172, 176, 334, 628. The book I got with the scanner says
172-HEGO (HO2s) sensor fault/lean
176-HEGO (HO2s) sensor fault/always lean
334-EGR closed valve voltage high
628-Excessive converter clutch slippage
Here are things I have done
Just did fuel pump two days ago
Fuel filter
Oil change with filter
New ignition system (performance distributors distributor , performance distributors screamin demon coil, NGK iridium spark plugs which are gapped at .64" bc of coil, performance distributors live wires spark plug wires, and a performance distributor TFI module)
I also cleaned the MAF about 2-3 weeks ago (when I unplug it car runs rough so it's good) can't think of anything else that would be related. Any questions ask! Thank you

Ms29402 01-02-2014 09:48 PM

Going to change fuel regulater because I do smell gas in vacuum line.

johnGT 01-02-2014 10:20 PM

o2 sensors could definitely be causing your symptoms. The bad part is, they are around $60 each...the good part is, they are easy to put in.

Ms29402 01-03-2014 12:01 AM

Exactly. They are $50 a piece from advance auto. But I don't have the money to find Out that that isnt the problem.

Ms29402 01-03-2014 08:27 PM

I drive it today to work (17 miles one way several stops) and it was fine. CEL still comes on but it wasn't trying to stall not was the battery guage jumping all over the place.

Ms29402 01-05-2014 12:37 PM

Well I replaced the regulator and reset the computer and it's still coming up with the same codes.. And it's still running rough. Did a cylinder balance test and it says #4 has a problem so maybe injector?

johnGT 01-05-2014 12:44 PM

Quote:

Originally Posted by Ms29402 (Post 5672177)
Well I replaced the regulator and reset the computer and it's still coming up with the same codes.. And it's still running rough. Did a cylinder balance test and it says #4 has a problem so maybe injector?

It could be, or the plug isn't getting enough voltage. I know they aren't cheap, but if the computer is throwing o2 sensor codes and the car is running bad, the o2 sensors need replaced...
Let me guess..Your gas mileage lately is terrible too? Also a sign of bad o2 sensors. You can either keep throwing money into the gas tank or fix the sensors and save money in the long run.

Ms29402 01-05-2014 12:55 PM

Well I just did a fuel pressure test and with koeo it's 40 KOER 30 and then goes up when I press on the throttle body which I'm assuming it should do but are the numbers right? I have it hooked up now to see if the pressure drops

Ms29402 01-05-2014 01:08 PM

Ok so pressure is good and I tested it when vacuum line off and it jumped up at 40ish like it is supposed to. Luckily I do hear a vacuum leak behind the intake. Let's hope that's the problem

Ms29402 01-10-2014 10:17 PM

Not the problem but found out that the TFI module and fins needs to be bolted to the body to be grounded


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