help diagnose problem

RB92GT · 06-08-2002, 01:07 PM

Ok guys, this is a long one, sorry:

I've been having a strange problem with my '92 GT. It has about 45,000 miles on it and has a T5 tranny. Within the past 6 months, twice the car sounded like it was running on only 7 cylinders, but the problem only lasted a few minutes and then disappered. While cruising along, all of a sudden the car would hesitate a little, and the RPM's would slightly drop. After coming to a complete stop in neutral, it was idling at 500 RPM and was shaking badly. I popped the hood and the engine was shaking all over the place and was emitting a noticable tapping or clunking noise.
I have an electric fuel pressure gauge, vacuum gauge, and oil pressure gauge, all of which were in the normal range.

Within about two minutes, the RPM's would jump back to the 670 range where it should be, and the car ran absolutely great again. I bought a code reader and came up with the following codes:

KOEO (continuous memory):
95 (Fuel pump secondary circuit fault)

KOER:
94 (Air diverter solenoid circuit fault)
44 (Thermactor air system fault)

I have a fuel pump cutoff switch, and have turned the ignition on a few times with the switch off (circuit interrupted) so I think that's why I got a code 95. I removed all my smog crap, resulting in code 44, and maybe 94? What is the air diverter solenoid circuit?

I did a cylinder balance test, and all cylinders are normal. So, after all that, any ideas what the problem could be. After I had the problem the first time, I put a fuel injector cleaner in the fuel. I changed the fuel filter about a year ago, and did a complete tune up with 9mm FMS wires, plugs, distributor cap and rotor. Could it just be crap in the fuel getting caught in an injector?

Thanks,
Ryan

Agent_4573 · 06-08-2002, 01:26 PM

Sounds like your module is going bad... Ya know the grey box about 5 inches long attachted to the side of your distributor. My car something like that for a while, i ended up replacing my fuel pump and replacing the module, now it runs fine.

muskrat · 06-08-2002, 04:53 PM

The tapping or clunking noise sounds like a lifter is hanging up occasionally and not allowing the valve to open, probably intake. Good luck with the diagnosis.

06-08-2002, 01:07 PM	#1
RB92GT Registered Member Join Date: Jun 2001 Location: Gainesville, FL Posts: 13	help diagnose problem Ok guys, this is a long one, sorry: I've been having a strange problem with my '92 GT. It has about 45,000 miles on it and has a T5 tranny. Within the past 6 months, twice the car sounded like it was running on only 7 cylinders, but the problem only lasted a few minutes and then disappered. While cruising along, all of a sudden the car would hesitate a little, and the RPM's would slightly drop. After coming to a complete stop in neutral, it was idling at 500 RPM and was shaking badly. I popped the hood and the engine was shaking all over the place and was emitting a noticable tapping or clunking noise. I have an electric fuel pressure gauge, vacuum gauge, and oil pressure gauge, all of which were in the normal range. Within about two minutes, the RPM's would jump back to the 670 range where it should be, and the car ran absolutely great again. I bought a code reader and came up with the following codes: KOEO (continuous memory): 95 (Fuel pump secondary circuit fault) KOER: 94 (Air diverter solenoid circuit fault) 44 (Thermactor air system fault) I have a fuel pump cutoff switch, and have turned the ignition on a few times with the switch off (circuit interrupted) so I think that's why I got a code 95. I removed all my smog crap, resulting in code 44, and maybe 94? What is the air diverter solenoid circuit? I did a cylinder balance test, and all cylinders are normal. So, after all that, any ideas what the problem could be. After I had the problem the first time, I put a fuel injector cleaner in the fuel. I changed the fuel filter about a year ago, and did a complete tune up with 9mm FMS wires, plugs, distributor cap and rotor. Could it just be crap in the fuel getting caught in an injector? Thanks, Ryan

06-08-2002, 01:26 PM	#2
Agent_4573 Registered Member Join Date: May 2002 Location: New Jersey Posts: 375	Sounds like your module is going bad... Ya know the grey box about 5 inches long attachted to the side of your distributor. My car something like that for a while, i ended up replacing my fuel pump and replacing the module, now it runs fine. __________________ '89 LX 5.0, off-road h pipe, flowmaster muffs, underdrive pulleys, rebuilt WC T-5, King Cobra Clutch, 65mm throttle body, Explorer Upper/GT40 lower, Lakewood Rear Lift Bars. 76mm C&L Mass air w/ inlet pipe, Twisted wedge heads w/ stage 2 port,polish, MAC equal length shorties, Billet AFPR, 255LPH fuel pump, fresh low end w/ 10.5:1 compression. If anyone ever wants to go to Raceway Park in Englishtown New Jersey, give me a shout. RICER HATERS CLUB MEMBER 87! www.ricehatersclub.com

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06-08-2002, 04:53 PM	#3
muskrat Registered Member Join Date: Mar 1999 Location: va Posts: 35	The tapping or clunking noise sounds like a lifter is hanging up occasionally and not allowing the valve to open, probably intake. Good luck with the diagnosis.