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    Fuse to pull for compression test?

    Hi, I'm about to do a compression test on my 5.0 and need to know which fuse to pull to stop the injectors from firing. I don't have the cover for my fuse box and don't know which is the ECU. I've already pulled the coil plugs. Thanks.
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    Speedo recalibration gear chewed up.

    Hi, I bought my car with a T5 (not sure which year) and 3.73 gears. The speedometer was off and I was told to correct it with a white 23 spline speedometer correction gear from steeda. It was perfectly accurate. But after about 5,000 miles I noticed my speedometer needle vibrating while...
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    Oxygen sensor voltage?

    I've been spending some time lately trying to figure out why my oxygen sensors won't turn on. I borrowed an analog voltmeter to do these tests. I tested the main harness plug that hooks into the oxygen sensor harness. One of the prongs was putting out 5V. So I assume that's the heater. I...
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    Charcoal cannister?

    I found a bad vacuum line running from the charcoal cannister to the manifold. I capped the nipple on the manifold and plugged the line running from the cannister. I've been thinking this may not be the best idea. Is it possible that with no way to release the pressure from the gas tank, the...
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    Vacuum line from oil filler neck?

    This is almost a waste of a thread, but I was wondering what the purpose of the vacuum line that goes from the oil filler neck to the throttle body is? I pulled it off to check for leaks but there wasn't any vacuum on it. :shrug: I always thought it was like a 2nd PCV valve, giving the...
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    Throttle Body Coolant Bypass?

    I've drained my coolant to fix a leak, and while I'm at it, I've been thinking about bypassing the coolant passage through the throttle body. It's obvious that the coolant will heat up the throttle body and part of the upper manifold, that has to cost SOME power, however little. What are the...
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    People with Longtubes...

    Did you ever notice problems with getting trouble codes 41, and 91 (oxygen sensors showing lean mixture), or any problems related to oxygen sensors or running rich when you installed the longtube headers? I've heard that this can cause the oxygen sensors to show a lean mixture, causing the...
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    Oxygen sensor ground location?

    Sorry about starting a new post, but the title of this one is a little more clear and related to what I need. In an effort to track down why my o2 sensors aren't working, I've started looking for a ground that I'm told is somewhere behind the engine. It supposedly has an orange wire. My car...
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    Which o2 sensors do you use?

    I've had an ongoing struggle with my o2 sensors, and I think I've narrowed it down to just defective o2 sensors. I used some Bosch kind that I got from autozone. They fit the plugs perfect and even had the correct number of wires and all that. But they just plain don't work. What do...
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    02 sensor questions

    I've noticed my o2 sensors haven't worked since I bought my car about a year and a half ago. The car had one o2 sensor plugged in, and the other had the wires cut. So I replaced both o2 sensors. I get check engine codes for both sensors failing to turn on as well as terrible gas mileage and...
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    o2 sensor harness question

    I'm about to go pull out the o2 sensor harness and test it with a multimeter, but I noticed part of it plugs into the oil pan, probably the level sensor. Does this plug just pop out or do I have to use a wrench? It doesn't appear to be a hex nut, and it's abnormally large. I tried pulling on the...
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    Irritating idle surge

    I have an idle surge in my 93 mustang 5.0. It's very irritating and doesn't happen all the time, just randomly, regardless of if the engine is warm or not, it seems. I can find no cause for it to happen. As far as I understand, if you have idle surge, it should happen all the time or while...
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    Need help with escort, no where else to turn to

    Hi, I'm helping a friend fix her car. It's an 89 escort. I know of no escort forum where anyone can actually give helpful information. I can only imagine the things the escort performance clubs would suggest.:rolleyes: I have been around for a while, so it's not like I'm just using this...
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    Steering shaft U-joint?

    I have about a half inch of play in my steering. (From the steering wheel) It makes the car feel like it's 30 years old. I have traced the play to what looks like a U-Joint (If that's what it is) about halfway down the steering shaft. I looked at someone's Ford Ranger and it had a piece of...
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    turn signals not working???

    My turn signals stopped working. Before they did, the flashing speed would fluctuate from very fast to slow. I can turn the hazard lights on, and all the bulbs work. I checked the fuse, also good. Any ideas?
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    3 wire 02 sensors??????

    I got new oxygen sensors from Autozone (don't remember the brand, it wasn't the factory ford ones) about 3 months ago and they have 3 wires coming from them. Two white and one black. I just assumed they were the right ones, since the computer said so, and I didn't have any other sensors to...
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    H pipe problems

    I recently purchased a Mac off-road H pipe to replace the H pipe I had on at the time, a MAC O/R pipe that I had 2 cats welded up to for e-check. I tried to put it on, but it was about 3 inches too short. I put it on top of the old MAC H pipe and yep, about 3 inches shorter. I ordered it...
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    driving with open headers OK?

    I just took my H pipe off and now my car has open long tube headers. I am kind of curious as to how it will sound and I was wondering if it would hurt anything if I took it for a ten minute drive? My main concern is all that hot exhaust frying something under the car. It looks like it exits...
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    Did mach 1s come with a LSD?

    Did the original mach 1s come with a limited slip differential? Thanks.
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    Does removing the smog pump cause trouble codes?

    Hi, I recently checked my engine codes and got the codes 41, 81, and 91. The 41 and 91 are from the oxygen sensors not working. I can verify this with terrible mileage and black tailpipes. The 81 is from the "thermactor air circuit." I have removed my smog pump and plugged the lines. I...
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