Hey guys, I need some help! Car is a 1994 Le Sabre, 87K miles. Car has been in the family since new, I'm the only person to ever work on it which has been very rare. Car is in really nice condition.

Car was driven four days ago on short trip(2 MILES), no problems. Attempted to start car Tuesday, cranks over fine, no start.

Spark plugs are firing with a good fat spark.
Fuel pressure is 42 lbs
Have power at the injector plug with ing switch on
Checked with noid light in inj plug, cranked engine and no pulse
No trouble code stored, checked with scanner

Spent several hours last few days on the web looking for clues, found lots of conflicting info.

Started to change the Crankshaft Position Sensor, but read that if the plugs are firing, the CPS is good? Any thoughts on this.

One other detail that is a little odd, both coolant fans are coming on when the ingnition switch is in the on/run position.

Thanks
Joel

Cooling fans may or may not be related, but that is odd. There are several things that can cause them to run when cold, a few of which can relate to your problem.

What does the security light do on this car? Does it stay steady, flash continuously, or flash a few times and then go out?

Do you have the ability to scan codes on this car? Is anything else acting funky on the dash such as warning lights, radio, climate control, etc?

Security light comes on when ign switch is in "run" position. Stays on steady for approx 10 seconds and goes out.
Yes, I did scan for codes and there are none.
No climate control, this is a basic LeSabre. And nothing else funky. Everything else seems to be OK.
This is really a surprising problem with the car! Last time we drove it everything was just fine.

Thanks
Joel

Yeah weird. You've covered the basics I'd cover.

87,000 miles in 22 years sounds like lots of short trips therefore heat cycles. If it hasn't ever had a CPS replaced I'd go ahead and replace it and see what happens. Perhaps plugs are indeed firing, but in the wrong order because CPS is giving bad information? Perhaps CPS signal is bad enough that injectors aren't firing or somesuch?

Either way it'd be good insurance so you don't find yourself someday saying [aw shucks I wish I had replaced the CPS after all . . . before replacing the flux capacitor, inertial dampeners, and dilithium crystals]

Sure you can read ALL codes? most scan tools/readers, only read "P" codes....

No injector pulse means, problem with Security system, bad ICM(no ref signal), or bad PCM.....

If you have spark, the crank sensor is ok.....

Thanks for the replies.
I started to change the crankshaft position sensor but after some reading, most
of the info I found said that if there'* spark then the crank sensor is working.

With the coolant fans coming on as soon as the ing switch is turned to run position, I'm leaning towards the ECM.

I'm not 100% sure all codes/info is being displayed by my scanner. I've used this ACTRON for many years on different cars. I was just glad it would actually "talk" with this OBD 1 1|2 system.

Thanks
Joel

When PCMs fail, they typically like to set a bunch of unrelated codes, sending you on a wild goose chase.

Are you able to see a rise in engine RPM while cranking on the tachometer (if so equipped) or realtime data on the scanner? I am wondering if there is an issue between the ICM and PCM.

Also look at coolant temp if you can according to the PCM. Although I would expect a coolant temp sensor failure to set a code...

Car does not have a tach. Scanner shows coolant temp same as outside air which is about 80* today.
Scanner will not show correct RPM'* when cranking, stays on 1k?

Joel

I just finished this check procedure: got to page 3, step 6. And the answer is NO. Light did not flash.

So, looking more and more like a bad PCM?


Joel

http://ww2.justanswer.com/uploads/JH...9_203717_2.pdf

Sounds like bad PCM, or a problem with the injector circuit, I have heard of the injector circuit failing before.