92 Q45 no start

[badbadlee]

help!!!! i have a 92 q45 with a no start prob!!! it has 50 psi fuel pressure spark on all 8 coils has pulse on injectors and has 140 psi of compression i know it has 2 cam sensors and 1 crank sensor but i dont know if they are the problem i am at a loss i am used to working on american cars with less sensors. i live in las vegas if the heat has any thing to do with the cause of my problem help please leroy

[maxnix]

Please give us an accurate description of what occurs when you turn the key. Not flooded?

A brief maintenance history and note on its condition may help with a car we cannot touch nor hear.
Modified by maxnix at 11:19 AM 6/16/2005

[DAEDALUS]

There's only a single "crank angle sensor" but it's located on the left head exhaust cam. The other 2 cam "sensors" are variable timing solenoids. If you haven't touched the CAS, and if you're getting spark on the plugs, then the timing should be OK. Ditto Maxnix: You're sure it's not flooded? How long since it first refused to start?

[badbadlee]

i thought that so i checked out plugs all dry thats not a problem. which sensor decides which plug and injector fires first ?please help leroy

[badbadlee]

new plugs ,one new module 140xxx miles and it just broke down about a month ago ? any thing else needed info needed let me know

[maxnix]

it has 50 psi fuel pressure

After the fuel filter? More data, please.

[badbadlee]

yes i taped into line at rail up frt on top ?

[badbadlee]

yes up top right at the rail leroy

[DAEDALUS]

Have you tried cranking it with the gas pedal mashed to the floor? This will shut of the fuel injectors to clear any flooding.

[badbadlee]

yes it sounds like its trying to hit on a couple of cyls but never actually starts

[badbadlee]

ques? does parts from a 94 q45 interchange with a 92 q45?

[Qgrappler]

My 94 Q will become unwilling to start if you start and move it a short distance and let it sit. A dealer told me they have the same problems arising from moving cars into the garage and back out again after servicing. .

The solution is to have a strong battery and to hold the pedal all the way to the floor, and have the guts to let it keep cranking. When this "lock-up" occurs, or whatever you want to call it, it takes a long attempt to start it before it kicks in. I would say, in some cases maybe 15 seconds or so, which seems like an eternity.

[badbadlee]

i have tryed that for longer than 15 seconds prob 30! i think i have a set of bad injectors the 2 i can get to one is leaking and ohm at 14 and the other one is at 26 ohms and i know thats bad also the wiring harness dont look the best is there a replacement ends or injector harness?

[badbadlee]

does any one know how ignition modules work ? do the same side cyls fire off same side module or are they split???? i have a 94 q45 also i am working on and the exhaust temps are way different one side is at around 300 deg and the other on is at 130-150 is this poss a bad module ??? how do i ck the modules????

[DAEDALUS]

There's an ignitor on each head that is controlled by the ECU to break current to the COPs. If you're getting spark I don't see how the ignitors can be the problem, but check to make sure all the harnesses under the hood are connected. Probably not easy to check the ignitors without a scope or at least an inductive ammeter.