Engine miss and running rough, need help!
nowrb
05-31-2009, 07:23 AM
The car is a 1992 3000Gt vr4, 62k original miles.
It has been sitting for a few years. I purchased the car from original owners son.
The engine has a miss on the back cylinder and does not seem to run
like it should.
The things I have done are replaced the coil pack, plugs, wires,cleaned the injectors, compression check, all cylinders good, about 150 each.
tried another MAFS sensor. The car seems to run rich, sluggish, I would say about half power. Also no Check engine light.
Would the ECU cause this?
What would you guys do next?
It has been sitting for a few years. I purchased the car from original owners son.
The engine has a miss on the back cylinder and does not seem to run
like it should.
The things I have done are replaced the coil pack, plugs, wires,cleaned the injectors, compression check, all cylinders good, about 150 each.
tried another MAFS sensor. The car seems to run rich, sluggish, I would say about half power. Also no Check engine light.
Would the ECU cause this?
What would you guys do next?
91STT
05-31-2009, 11:49 PM
With a 1G, there can always be an issue with the ECU caps. I would check the injector resistor pack. It may be causing one of your injectors to operate improperly.
nowrb
06-01-2009, 11:12 AM
I checked the resistor pk and it test good, 6 ohms each one to #4 terminal
I pulled the ECU and It looks like new, no leaking.
Any other Ideas, I have the service manual if there are other test I need to do.
Thanks
I pulled the ECU and It looks like new, no leaking.
Any other Ideas, I have the service manual if there are other test I need to do.
Thanks
Shogun888
06-01-2009, 10:21 PM
I checked the resistor pk and it test good, 6 ohms each one to #4 terminal
I pulled the ECU and It looks like new, no leaking.
Any other Ideas, I have the service manual if there are other test I need to do.
Thanks
I'm not sure what the problem is but I would reset your tps, check your sas and ignition timing, since its been sitting a while I would change the fuel filter and run some cleaner through it but you probebly did that allready. make sure the injectors are stock and check for good exhaust flow. Dont know why it would need a new timing belt but check that and proper tension
I pulled the ECU and It looks like new, no leaking.
Any other Ideas, I have the service manual if there are other test I need to do.
Thanks
I'm not sure what the problem is but I would reset your tps, check your sas and ignition timing, since its been sitting a while I would change the fuel filter and run some cleaner through it but you probebly did that allready. make sure the injectors are stock and check for good exhaust flow. Dont know why it would need a new timing belt but check that and proper tension
nowrb
06-02-2009, 09:06 PM
Not sure how to reset the TPS, but the timing was off a bit, advanced.
Was at about ten degrees. Reset to 5 degrees according to the service manual.
I check the fuel pressure and it is a little low, about 27 lbs. replaced the fuel filter and now about 34 lbs at the supply line, shouldn't it be at least 45lbs?
Will be replacing the fuel pump next.
What are your thoughts?
Was at about ten degrees. Reset to 5 degrees according to the service manual.
I check the fuel pressure and it is a little low, about 27 lbs. replaced the fuel filter and now about 34 lbs at the supply line, shouldn't it be at least 45lbs?
Will be replacing the fuel pump next.
What are your thoughts?
tattoodeziner09
01-19-2010, 11:23 AM
I'm having the same prob. with my 91. whenever you find out what the prob. could you email me at [email protected]... thankyou
Automotive Network, Inc., Copyright ©2026