Poor performance

Hi Ken. Well, I didn't have a newer type of fuel pressure tester but picked one up yesterday. It is confirmed about the fuel pump. The pump itself is good but the regulator must be leaking. I tested it just awhile ago engine not running or cranking. I was doing it myself and never got initial reading but the reading I did see was up then slowly went down with key on. Unfortunately this regulator thingamajig along with filter are all in the tank. This technology sucks. From buying one thing to having to buy everything all at once. I hope this will solve all of my issues. But thank you for leading me in the right direction.

Hi Ken. Well I had replaced my fuel pump, as well as my throttle body which had the TPS installed already. I hooked up a scan tool and got some readings from my fuel trims. They are STFT B1 -0.8 to -3.9 LTFT B1 11.7 STFT B2 -3.9 to 1.6 LTFT 4.7 to 5.5 There is a spike with all of these numbers that jumps way up to 93.8 for a second or 2. My O2 readings are O2S STFT B1S1 34.4 O2S STFT B1 S2 99.2. I haven't looked yet or tested but I'm thinking a vacuum leak somewhere. Just wanted your opinion on these readings. Or on why I would get such a spike in my reading to go up to 93.8%? These readings were taken with the engine warm and at idle.

I'm still having the same issues.

Hello. I did a test a few days ago with my scan tool and watched my fuel trims again. I did it at idle then at 2500 rpm. I didn't see any numbers going down. I did see a number or two going up. I do not remember which of those it was or how far it went but. Going up isn't that different from a vacuum leak. If I had a vacuum leak would it not run rough at idle? It does not run rough. I haven't done any test yet for that yet due to the whether being cold also this test I did points me in another direction Also.I am still unfamiliar using my scan tool but.I cam up with a bunch of codes that wouldn't show up just using a code reader. The majority of them point to transmission codes. With so many codes I am wondering where to look first. The TCM or the PCM or ECM. Majority of those codes were P08 type of codes. I also got a P0900 and a P090C which points to the clutch actuator circuit for 4 wheel. But this does work Along with some U type of codes Like U2608 and U1108, U3A08. There are others. I'm not sure but I think they have to do with current supplied to a component. I do not know where the TCM or PCM or ECM are yet either to begin looking at the wiring and ground. But I think all of what is going on now is some bad wiring or one of those modules is cooked.

Are you telling me you cannot tell if there is a vacuum leak using a scan tool? That it is impossible?