94atx, crank, no start, stupid mechanic=fun

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speedfreek95

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Just thought I would share my weekend fun to see if someone can help shed some more light onto my problem.

A little bit of background info. This guys 94 ATX 138k was running fine and dandy until one day, when he was sitting at a stop light, it just cut off. No running rough, just good then dead. He tried cranking and cranking till the battery finally gave out, and called a tow truck to take it to a local repair shop. fast-forward a few days and this "mechanic" has given him quite the run around not having any clue what the h*ll he was doing and replaced the Crank sensor, water pump, timing belt, DIS AND the coil pack. talk about throwing parts at the problem. The guy charged him $1800, and the problem is still there. Then the owner took it to a ford dealer, who told him he needed a new ignition switch. this is where the guy gave up, and through word of mouth found me. Heres what I found:


-the brand new dis was secured with the two top bolts and the bottom two were cross threaded into the crossover tube and the heads were broken off....probably not the best ground so I put a good crossover tube and working DIS on it, made sure everything was grounded, cranked it, no dice

-The plug going to the coil pack was *****'d and the wire harnes between there and the TPS was all stripped off. new convoluted tubing, electrical tape and one used plug later, still no dice, but there is power going to VBAT at the coil, but nothing to fire.

Inside the car- tach was steady at 400 rpms while cranking and the CEL was on, so the CID should be fine.

Onto the CKP I started to backprobe the connector with my LED test light (did not have a dmm nearby, will go back out with that tomorrow), got power from the vbat, and then it got weird. I probed the PIP wires to check whether they were flashing while cranking, but the both had constant power whenever the key was in the run position. I did the same test on my SHO to make sure I wasnt being stupid, and it did what I thought it should. no light when key first turned to run, flashing while cranking, and solid(or flashing fast enough I cant tell) while running. But the ATX was SOLID from the second you turned the key top run, through cranking, and stayed solid after cranking. So I'm thinking that there is a short somewhere in the CKP wiring, or the new sensor is bad. The other thing that I'm curious about is that I doubt the guy who put it on had any idea about how much to space it at installation. but could the improper distance cause the sensor to send a signal 100% of the time? Anyone have any ideas about this? or is there something else in the system that could cause this. Am I being super ********?

I have already come to terms with the fact that I will have to tear apart the front of this guys motor to get to the ckp and double check/fix what the previous guy did, and have prepared the owner for such an event, but I'm curious as to whether or not there is something else I can be looking for while doing it. I'f had CKPs go out on me before, but never had one give me those test results. phew that was long

brendan
 

speedfreek95

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completely forgot a few things:

fuel pump runs as normal when key turned to run posistion. Pressure at 39psi

did the wiggle test on the tps and all the dis connectors while cranking, no effect.

checked the ignition and low-coolant fuses(as well as the rest while I was in there ) all OK

While I was back backprobing the CKP sensor plug, I had two times where the probe was testing the PIP wires and while the key was on run but not cranking, I heard what sounded like a relay clicking(maybe a plug firing?) and the fuel pump ran for 2 sec and shut back off. Possibly a ground problem in the DIS harness somewhere? I'm planing on testing all the wires I can tomorrow when I have my dmm, but any other ideas?
 

SHOZ123

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If the crank sensor is touching metal or very close to some it will send out a constant signal. Or if the wires are shorted.

Don't know about the V6 but polarity is also critical on the V8 crank sensor.
 

93rev2sev

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Is the engine sparking?

You already said it's getting fuel.

does it pull vacuum while cranking?

Just verify the big 3. Don't get too technical.

It needs spark(on time), Fuel, and air....thats it.

You obviously know this...but lots of times people over think...That ******* mechanic probably wires the holes backward.
 
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speedfreek95

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93rev2sev, sorry, forgot to say no spark, leave it to me to forget the whole point of the message. Fuel is fine as is vacuum. and looking through everything, I see no reason for it not to be getting air.

SHOZ123, thanks, thats what I was wondering about. I was thinking that the last guy either didnt gap it enough or somehow got the wires caught were they shouldn't be and crushed em, creating a short. I will check for that by seeing if there is continuity between the vbat and pip wires once I know that the isn't too close to the vanes such that it would always be there. Too make sure I was doing it correctly last night, and not having the leads backwards or in the wrong place, I did the exact same thing on my running SHO, and got the results I was expecting.

I guess I'm definitely going into the front of the motor, maybe I should suggest the guy do the rest of the 120k since, with all the stuff the last guy replaced, he's already half way there in parts, new CID, cam and crank seals and the lower will be done:thumb:

Brendan
 

speedfreek95

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OMG, Finally got the motor apart today, and good lord what a mess. Seems the idiot mechanic mounted the CKP such that it struck the vanes, bending them and breaking a huge chunk out of the brand new sensor. Yippie. Any chance the vane is the same on the 3.0 and 3.2? if so I can get one from my parts car, along with the CKP sensor and put her back together. I love fixing other peoples expensive mistakes ;)
 

93rev2sev

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Crank sensors are the same but don't use an old one. Get a new one From autozone.

Wells SU242 is only 36.99 in the detroit market.
 

speedfreek95

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Crank sensors are the same but don't use an old one. Get a new one From autozone.

Wells SU242 is only 36.99 in the detroit market.

Definitely wont use the old one, i've got two new ones sitting around. I would prefer not to have to touch the front end of this motor again for quite some time. Sounds like tomorrow will be a fun sho-filled day
 

TimboSHO

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I think he should take it back to the place that put the CKP in and demand his money back! Make sure you have pictures, or just take the broken parts in to show them.... I hate idiots that don't know what they're doing. That's what I'm dealing with on my 94ATX no start right now. I keep finding more and more problems that were created by the last idiots that worked on it......
 

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