how does a crank position sensor work?
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Joined: Jul 1999
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From: 51°N 114°W, 3500'
Car: 87 IROC L98
Engine: 588 Alcohol BBC
Transmission: Powerglide
Axle/Gears: Ford 9"/31 spline spool/4.86
It will crank and not fire.
The computer uses the CPS to detect where the crankshaft is in rotation. It the computer can't tell if the engine is cranking then it won't know what cylinder needs to be fired. Until it gets a CPS signal the computer thinks the engine is stopped.
Ford Powerstroke/Navistar engines are bad for that. It's the most common problem for a nostart complaint.
Note: I race against a Monza that looks like that.
The computer uses the CPS to detect where the crankshaft is in rotation. It the computer can't tell if the engine is cranking then it won't know what cylinder needs to be fired. Until it gets a CPS signal the computer thinks the engine is stopped.
Ford Powerstroke/Navistar engines are bad for that. It's the most common problem for a nostart complaint.
Note: I race against a Monza that looks like that.
Last edited by AlkyIROC; Jan 5, 2002 at 12:32 AM.
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Joined: Nov 2000
Posts: 762
Likes: 2
From: Riverside, CA
Car: 1987 Camaro IROC-Z
Engine: 305TPI
Transmission: 700R4
thanks Stephen 
my Vega is a V8 project, should be a quick car.. my sig has a horrible pic but whatever
i'm thinking it's the CPS, too.. seems to be the most common problem that I've come across as well.. i've been reading FAQs on the net all night and 90% of them are the CPS
ttyl man!
colin

my Vega is a V8 project, should be a quick car.. my sig has a horrible pic but whatever

i'm thinking it's the CPS, too.. seems to be the most common problem that I've come across as well.. i've been reading FAQs on the net all night and 90% of them are the CPS
ttyl man!
colin
jeeps are pretty notorius for the CPS to start to crap out early. My dad has 2000 grand cherokee with 65K miles on it, and the thing cranks and cranks before it finaly kicks over. and if U accidentaly stop and then start cranking again quick, it throws the timing out of whack and runs like **** until you reset the ECM. just my little addition lol.
my dad used to have a 70 something vega which orignaly had a 4 cylinder and he put a built 350 in it. It sounded good it had side pipes on it and it ran low 12s also he had NOS to put I dunno how much. I just know this car was scary.
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