Another 944 Wont start problem HELP!!!!!
 

Good day all. I have a 1986 944 N/A car has been fun and very reliable the last five mouths I have owned it until last week.
After a nice detail job on the car and a little cleaning on the motor It just wont start;
I do not have spark coming from the coil to any plug wires nor when I put a plug on the end of the wire coming from the center of the coil. Here is what has been looked at or tested.
Timing belt is spinning
Swapped out know good DME relay
Swapped out know good coil.
Put my ECU in another car his car started great.
Power from battery is good

Checked reference sensor by pulling it and passing a screwdriver pass it to make sure it is getting a reading. numbers jumped up and down so I think its working.

Motor cranks and dash lights come on.
Swapped thee two wires for I think speed sensor and reference sensor still no spark
Checked fuel pressure by pulling a line and fuel pressure is good when motor is cranked.
injectors show like 1.4Mv solid. Arent thay suppose to turn on and off??
For grins jumped the coolant temp.

So after all that still no spark, What parts control the spark to the engine? I have power at the + side of coil when key is on and when cranked the - neg, side of the coil show hot as well, is that normal. I am out of ideas, So No comment is a bad comment ideas gladly welcomed. Thanks
http://forums.pelicanparts.com/uploa...1311816480.jpg

check cap and rotor, i didn't see that in your post unless i missed it. otherwise probable dme failure.
someone else might have more to add.

Hey fwayfarer,

He seems to have checked the DME already.

When I tested the injectors on my car yesterday the readings pulsed, and didn't remain static, as you report.

Good luck from a fellow-sufferer.

I don't have the expertise, but you're not getting many answers, so I'll start the ball rolling with a question.

You said the problem started after you did 'a little cleaning on the motor'. What did you clean and how?

Good luck.

9944 start
 

I was not the one who cleaned the motor. But a firend was doing it. I dont think he used water but will find out. All connection have been checked and re-checked. I have overlooked the harness and no signs of cracks where water can get in but you never know?

I know you did your own test, but Clark's Garage has a pretty precise procedure for testing the speed and reference sensors.

Speed and Reference Sensors - Checking, Replacement, and Adjustment

I wonder if the electrical connectors might not have got damaged in the engine clean.

Hopefully the real experts here will chime in with better suggestions.

Check the fuel pump fuse. If it got hit by water, could have blown when you first fired it up.

Got it
 

As you all know the speed and reference sensors is always suspect when no pulse comes from injectors along with no spark,

Well even if you do the wave screwdriver test and you get a reading that is not good enough. I did and had to go back to steps 1 2 3 only to just pull both sensors replace them and car started right up.

Save yourself the time get a scope I am buying one today. Thanks for all the tips learned allot about my car today.

Heel,
Glad to your got it sorted out :) Were you getting a tach bounce during start? Classic ref sensor fail.