AboutCAJUNSC/RAMBLER390 Expertise 1998 and NEWER questions ONLY!! I WILL REJECT QUESTIONS FROM 1998 BACK. Electrical diagnosis. Brake Diagnosis. Driveability, Service Engine Soon Lights. Some Engine mechanical. Tires and wheels. ABS. HVAC. Air Bag (SIR). Interior, seats, etc... 6.6L Duramax Diesel diagnosis. 6.5L diesel diagnosis. I WILL not answer Alignment questions OR carburetor questions. No heavy internal transmission
I need YEAR, MAKE and MODEL of vehicle, and ENGINE SIZE and TRANSMISSION type, IF applicable to the question.
I work at a Large, Busy GM Dealership
Last thing, my answers are JUST SUGGESTIONS and ADVICE and you should ALWAYS CHECK with your mechanic for proper diagnosis and repair.
Experience 18 Years GM Dealership experience as an "A" line tech. ASE MasterTechnician. 100% GM certified MTC Certified.
Education/Credentials High School graduate. No College or higher learning.
Question I have a 2001 4x4 with a 4.6 motor.I recently cut the cat- inverters out .My problem is every now and then the truck loses power and the check engine flashes a few times and the black smoke pours out of it .It might happen a few times one day ,not very reguler...A friend checked the code and he thought?? that it was running lean on a couple of cylinders..It almosy seems like its flooding
Answer Hi-
What was the code? p0174? or p0171?
I would check the fuel pressure rguulator (small round regulator located on the DRIVERS side fuel rail, underhood) Pull off the small vacuum line off the regulator, if there is ANY gas in that vacuum line, that is your problem.
Also if the converters were cut off and NOT replaced, you may have the o2 sensore sending low readings to the computer, and the computer is trying to falsely enrichen the mixture.
Thats my best advice with information given.
Thanks
Pawl
