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Not surprising as the second most common case for misfire (after ignition problems) is valve problems ie; clearance or a burnt one. It's also a common cause for high HC. It should never be the TPS though, regardless of what others have experienced. Just doesn't make sense based on how the ecu...

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2000 is high for a code 51....high for a car that's otherwise working right and in good shape. From what I've observed many of these cars aren't likely to be 100%. His idle problem may be TPS related only in the sense something else was wrong and was being masked. Or it could be unrelated. My...

It sure can. Remember, the IDL contact is what enables and disables the ISC system. Code 51 signifies no IDL contact close, thus no ISC operation. Unplugging the TPS always results in an altered idle. In fact that's about all it'll result in other than a slight enrichening of the mixture.

Well, something like AMP PIDG terminals and an AMP ProCrimper are a far cry frm the crap bought at hardware and auto stores and the toy crimpers most people use. Fwiw crimped connectors are employed all over aircrat while soldering is not permitted in other than avionics. Also, a properly...

You're right. I looked it up. There's an overlap but from mid 83 onward they used TCCS. Still sounds like a wiring problem to me. The way to solve these kinds of issues is best done by signal tracing. Too bad he doesn't have a CPS simulator. They're not expensive and handy to have in these...

As I said, resistance in a high current low voltage circuit is bad news. It's like trying to suck hard through a straw while pinching it. In a circuit with such a restiction the electrons start bumping into each other and cause heat. It's no different than rubbing your hands together. It's...

It'll be 19 years next month. I'm the original owner.

It cuts off manifold vacuum and vents the FPR to atmosphere for about 90 seconds after a hot start. The ecu uses the coolant temp sensor to decide when to do it. This raises the fuel pressure to supress vapor formation and assist in hot starting. Unless you're boosting within 90 seconds of...

The fuseholder was the problem, not the relay. If it was the relay or a problem in the circuit it would've blown the fuse. I suppose you could've gotten a mislabled fuse but what are the odds? That the fuse burned but did not blow indicates a bad connection at that point. The wiring...

Bad connection in the cheapie fuse holder. Not enough clamping pressure on the fuse blade. Typical of those things. It explains why the fuse didn't open because excessive current wasn't flowing through it. Get better stuff. I see several things in those photos that could cause grief down the...

Ah, I see now. Well, the little part of it I can see seems wired right. Sloppy but right. I'd have that fuse closer to the battery but I'm splitting hairs. 12 awg will easily handle 30 amps in open air so the fuse will open before the wiring burns. Did the entire wire get hot or just the...

Either you're losing rest pressure or the FPU system isn't working. Probably a loss of rest pressure.

Yep, it's just an oxidizer. No more flammable than oxygen.

Do you know how many amps you'd have to pull through 12 awg in open air to make it cherry red? And the wires in the photo look pretty good for having done it ;).

Everything I've read here leads me to think you're lean too. Seems like a big pirate air leak somewhere. Peak EGT occurs at stoich and falls off either side as you go richer of leaner. Reminds me of when I used to fly big piston powered turboed airplanes and when we dialed the mixture back to...

You got it. Code 41 maybe, depends on the car. Look at the notation. This is why you should check codes on occasion and not rely on the MIL to tell you something is wrong. Code 51 monitors the idle switch in the TPS. Code 41 is the pot for throttle position. Two independent parts of the same...

Joel, will a code 51 illuminate the MIL? (page 136) cesupra: What other codes did you have? What are your emissions numbers?

Since the engine mainly depends on the AFM for calculating basic injection duration and since the throttle plate itself controls airflow the TPS is used as a trim and more as an accelerator pump than for throttle position. A more effective way would be to mess with coolant temp. Better still...

Sorry, seems my eyes are going. Touche ;) The book says 4-5 but looking at how the thing is wired, knowing what's inside the ecu, and considering the wide resistance spec for measuring the TPS, 3.5 looks correct. Fwiw mine is 3.5 and works fine.