cranking but no fire...IT FIRED!

[Stace]

OK, I just replaced the head on my car(93 dohc).

I left everything else alone and replaced everything on the newer head with the original stuff. It ran before I started.

BUT!! When I was hooking the turbo back up..The metal on the oil line to the turbo HIT the starter and sparked ALOT!

Now the engine is together it cranks but no fire...

-compressions fine..
-Getting fuel on the spark plugs..so fuel must be there and working.
-checked spark and its sparking fine.

Seems to thud a bit while cranking like its back fireing but no real ignition fire.


Code says I have a problem with the "QUAD DRIVER MODUAL" what ever that is...... Could I have messed up the pcm?

Its a auto swapped to a manual and running the auto pcm...
I have a spare manual dohc pcm from a 1st gen sl2..

Can I just change the pcm to see if thats the problem? or do I need to change the wire harness to a manual harness?

[Minivan Tuner]

check for correct cam positioning. [img]{SMILIES_PATH}/redface.gif[/img]

[Stace]

I had everything positioned right when I put the chain on..the cams and the crank should be timed togther.

Is there some way other then the crank sensor that tells the pcm were the cam is? compression vrs exaust stroke..etc..

[S.Bretz]

check for correct cam positioning. [img]{SMILIES_PATH}/redface.gif[/img]

+1


And the timing mark on the crank sprocket points UP, but the colored links on the chain go down.

[SupraCharged007]

[quote="325iwhat"]check for correct cam positioning. :?

[Stace]

[quote="SupraCharged007"]

check for correct cam positioning. :?

...what?

Anyway yes, The mark on the crank sproket is facing up, cams were in tdc,
and all the coloured links matched up.

The timing of the crank and cams are correct, But I dont think they are in time with the rest of the ignition system.

How does the PCM know when #1 piston is at TDC compression stroke or TDC exaust stroke? The crank sensor is reading the same thing at both times, its only the cams that are differant right?

I'm thinking that my #1 cylinder is sparking with no fuel on the intake stroke...and trying to inject fuel into the cumbustion stroke but the valves are closed....

If that makes anysense??

[Minivan Tuner]

[quote="Stace"][quote="SupraCharged007"]

check for correct cam positioning. :?

...what?

Anyway yes, The mark on the crank sproket is facing up, cams were in tdc,
and all the coloured ]

The PCM knows where the engine is in reference to TDC by the 7 (I think it is) markings on the crank trigger that passes the crank sensor. By lining everything up to tdc from the crank with its mark in the up position, the cams in the up position, it sees what it assumes is TDC and fires accordingly thanks to the programming of the OBDII. Correct me if I'm wrong someone.

Do this, pull all your plugs, lay them on the frame and have some one turn the car over to check for spark. If no spark, change out the plugs. After doing that, smell the cyl. for traces of gas and look in the cycl. to see if anything managed to get wet. If no, then there is a fuel issue. If both seem to work, something is mistimed... so for a final assurance, pull the fuel rail, point it somewhere safe and visible like at a heater, and then crank after letting the fuel pump prime. *Note... do not point it at a heater. Thats pretty much the break down of what to do.

Possibilities of no sparking = bad plugs, bad coils, bad ground somewhere, bad wires, bad connections @ the PCM and or the wires/plugs or wires/coils, bad crank sensor.

Possibilities of no fuel = fuel pump issue, loose connection with the pcm, stuck injector(s), no gas, bad crank sensor.

Also, check compression while the plugs are out for the hell of it. Or don't listen to me because I have absolutely no experience with this exact problem at all ever. CTS, change it, thats it.

[phat95nosdsc2]

a really easy way to check for fuel, spray some starting fluid in the tb, if it pops and runs for a second your not getting fuel...you sure you have everything hooked back up right?

[Stace]

its getting fuel, spark and has compression.

I think my PCM thinks its on a compression stroke when its really on a exaust stroke????

Well hers a thought...

It seems that if I swap my fireing order(spark plugs wires and inijectir wires) on my #1 and #4 cylinders and aswell with my #2 and #3 cylinders,

it actually should start..

[S.Bretz]

injectors dont' matter, all fire at the same time, so you can plug em in any way you want on OBD1...batch fire for the mutha fucking win.

Are you wires in the right order?

4-1-2-3 on the coil pack?

If you have fuel and spark and compression, then you should have spark...but it sounds to me like you got some thing out of time 180..that's about the only thing that will make it not start..

[Stace]

it mabye my eyes =but I hooked up a compression tester and a spark plug on the #1 cldr and it seemd to spark twice for every one compression stroke? Do they batch fire the2 sets of plugs too?

I hooked up a 12v light to the injectir conector and didnt get anything from it during cranking??????

Im gonna change the CPS and if nothing then swap the PCM and if still nothing I'll start tearing her apart again to check out if I actauly DID mix something up...But I doubt it.

Can anyone tell if my intake and exaust cams are in the right place? hehe!

[S.Bretz]

Its a waste spark system...there will be 2 sparks.

If its sparking, then the CPS is ok, I would check the injector fuse and the PCM fuses.

[saturn_06]

could just be dry gas


throw some gas treatment in there, let it sit for an hour (make sure you rock the car when you put it in so it mixes)

alot of ppl have been getting hit with dry gas here

[koolkash_45]

the people who posted for sure know more than i do but i had a wire spark against the alt. and it fried my computer and my car didnt run after that. but the other popele are most likely right

[Stace]

If the PCM is messed up..,, will all the dash lights and everything work?

should I get spark with a messed up PCM?