Nick's Rolling TGP Thread

[killinprixs]

Theres a brittle copper shielded wire in your CS wires, your going to have to peel the tape back and follow it as far as you can,   check continuity on that wire,  Jud told me long time ago that if that wire breaks, no start.... also the wires that give power to the ICM, 2 pin connector on drivers side of ICM. 

[TGP Nick]

How do you know you are getting no spark?  Did you pull a plug and try to crank it over or something?  Check the wiring for the CPS, get a multimeter and check continuity and circuit resistance from each pin on the CPS to the pin on the ECM harness.  Also if you are not sure it is spark then you might want to check out your fuel pressure with the key on?  or did we already check this :laugh:  Further check all your engine fuses to be sure.  Does the engine crank and turn over? 

Ken

The issue I am having right now is no spark.  I had someone crank it over while I checked spark at the plug, no spark there.  I also had someone crank it over while I pulled the wires, one pair at a time, checking for spark at the coils.. no spark there either.  This is not a fuel issue.  I checked and rechecked all fuses, they are all good.
The engine cranks and turns over perfectly fine, I just have no spark.

[killinprixs]

check to see if your getting power to the ICM , should be around 12 volts

[TGP Nick]

check to see if your getting power to the ICM , should be around 12 volts

How do I do this?  I know very little about electronics.

[cobracmdr]

Start going through the checklist in the service manual........it will guide you through all the tests to determine what the problem is.  Probably your best bet since you are just guessing at this point......you know so you don't replace everything but the problem and spend tons of money on it.  If you don't have a service manual you can get them on ebay really cheep.

Ken

[jimmy]

   the manual says the pink/black wire is the 12V and the black/white wire is the Ground.

[mfewtrail]

Nick, if you don't have a service manual, let me know and I'll scan the no start troubleshooting pages. At this point, your problem should be ECM related OR due to a broken wire/bad connection(at or near the ICM most likely).

[TGed]

Willing to bet the wire connector inside the plug at the sensor pulled out and isn't making connection. 

[cobracmdr]

Right time to get a multimeter and learn how to use it.  You can get a cheep one for 10 bucks at sears and it will do more than you will ever need for automotive troubleshooting.  You basically want to use 12 V setting DC and the continutity check which will beep if the circuit is closed.  With those to settings you can check the majority of anything on a car.  Good luck and take your time you will find the problem.

Ken

[killinprixs]

theres 3 connectors on the ICM,  the one with 2 wires (driver side)  is Power and ground just like jimmy says.  I think its mad at you for taking it apart with 50k miles on it?  j/k  good luck main

[TGP Nick]

I do have an 89 Grand Prix service manual and the two Turbo Grand Prix service manuals.

Krenzy sent me a spare ECM to try, so once I get that, I will swap it in to see if that fixes it.

If not, I'll have to see if I can borrow my neighbor's multimeter and test light.. this is my only car right now, since I sold my SE to Meltboy.

Willing to bet the wire connector inside the plug at the sensor pulled out and isn't making connection. 

Where exactly are you talking about?  The CPS?

Thanks a lot guys :thumb:

[TGed]

CPS.

[killinprixs]

You said that every sensor is brand new , sure you plugged everything back in?

[TGP Nick]

Positive.  It ran perfectly for 5 minutes and shut off.  All sensors are plugged in.

[meltboy11]

thats not to say that something didn't get shaken lose and fell out in those 5 min...