- Location
- Colorado Springs, CO
I've read some of the threads, enough to go check the exhaust manifold for cracks, check to see if the upstream O2 sensor fuse was good, if it was plugged in. All was nominal. This is the same 97 XJ, 163K, AW-4, 4.0, from last summer that I couldn't get to run, and replaced plugs, wires, IAC twice, CPS, TPS, TPS harness, IAT, coil, both O2 sensors, distributor, computer, checked continuity on leads, checked resistance on grounds, probably more.
Recently, just before COfest like last year, it started wanting to die when the brake was pressed. I replace the brake booster to no avail. It had an aftermarket cruise control. Since I removed that today, it is better, but now has the 171 code. No vacuum leaks that I can discern. Every vacuum lead I disconnect causes an increase in idle speed. Haven't done any spray testing. Nor have I tested the fuel pressure, or tried fuel system cleaner, though I did a can of the Chevron stuff last year.
I have a Turbogauge, a knockoff of the Scan guage. The FTZ reported is always for the NSS, which I already replaced, and in the opinion of a trans shop has nothing to do with it. I've been reading about STFT and LTFT, but I can't say it has completely sunk in yet.
I'm taking it to the recommended shop for electrical problem tomorrow, but I'd still like your input.
Thanks,
Fred
Recently, just before COfest like last year, it started wanting to die when the brake was pressed. I replace the brake booster to no avail. It had an aftermarket cruise control. Since I removed that today, it is better, but now has the 171 code. No vacuum leaks that I can discern. Every vacuum lead I disconnect causes an increase in idle speed. Haven't done any spray testing. Nor have I tested the fuel pressure, or tried fuel system cleaner, though I did a can of the Chevron stuff last year.
I have a Turbogauge, a knockoff of the Scan guage. The FTZ reported is always for the NSS, which I already replaced, and in the opinion of a trans shop has nothing to do with it. I've been reading about STFT and LTFT, but I can't say it has completely sunk in yet.
I'm taking it to the recommended shop for electrical problem tomorrow, but I'd still like your input.
Thanks,
Fred