1993 Toyota Camry Chugging - Engine


Question: Hoping you can help me with this one. This is with my wife's 93 Camry XLE V6. The car is experiencing a cold start problem similar to a bad choke if it had a carbeurator. It idles rough initially and usually dies unless you drive off right away. Initial acceleration for the first 5 or 10 mins until the engine comes up to operating temp. results in a chugging until speed increases to say 30MPH. After warmup, it is fine. I have checked the ECTS with the engine warm and cold and it is within spec. I took the IACV apart and cleaned it, although it did not appear to be that gunked up. I also cleaned the TB out. I checked the coolant level which was topped up ok. I also checked the cold start injector switch and the injector resistance. All appear within spec. I also pulled the EGR valve and cleaned it up a bit. I tried starting the engine up cold with the EGR vaccuum line disconnected/plugged. No change. The wires, rotor, and plugs are less than a year old on the car (140K miles). My latest attempt was replacement of the fuel filter (which I believe has never been replaced). No change. I intend to measure the fuel pressure at the injector rails shortly to make sure it's ok. Can I check for anything else? Also, is there a method to check for proper operation of the IACV like say plugging and unplugging its connector while the car is running to see if the engine responds or something? Thanks


 
Technican: Anytime you press the gas slightly you are virtually eliminating any concern with the iacv (that is if the problem is still present). You have the right idea to check fuel pressure when the problem is present.
Owner: I measured the fuel pressure tonite. It seems a little high based upon the Haynes manual for the car, although there seem s to be a single spec for both the V6 and 4 cyl engines in that manual. I am getting about 38PSI at idle, and 46-48PSI when I disconenct the vacuum line to the pressure regulator at the rail. I assume then that high pressure could cause a rich mixture? Does this make sense?
Technican: Did the instructions in your manual tell you to check fuel pressure with engine idling? What pressure did your manual list as normal? I haven't viewed a haynes manual for a camry. Here are some instructions for checking fuel pressure- FUEL SYSTEM PRESSURE 38-44 PSI(POUNDS PER SQUARE INCH) DISCONNECT THE NEGATIVE BATTERY CABLE, AND INSTL A FUEL PRESSURE GAUGE IN THE FUEL LINE ASSEMBLY. ATTACHAN ELECTRIC JUMPER WIRE BETWEEN DATA LINK TERMIN NUMBER (1), AND THE +B TERMIN, AND THE FP TERMIN. VERIFY THAT NO LEAKS ARE PRESENT, AND RECONNECT THE NEGATIVE BATTERY CABLE. WITH THE IGNITION KEY IN THE ON POSITION, ENERGIZE THE FUEL PUMP. THIS WILL BRING THE SYSTEM TO A STABILIZED FUEL PRESSURE THAT CAN BE VISULY VERIFIED ON THE GAUGE. Sorry for the delay, my internet connection quit working for a while.

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