No Spark...

[benharper]

Okay, so I sent the SHO off to be fixed (front 60k) and the guy working on it says it's not firing. No spark. He swapped the box pn the side of the manifold (name eludes me) and the Coil Pack. He says it's getting power at the pack but no spark... I'm confused, and so is he. I had painted the manifold, but I think I cleaned off all the contact points... I haven't been up to look at the car myself, so I don't have much info other than what he told me. Any Ideas? Thanks in advance.

 

[jedhead]

Crankshaft position sensor is the most likely cause of no spark condition.

Bob

 

[benharper]

Crankshaft position sensor is the most likely cause of no spark condition.

Bob

That's why the car was in, he changed it, then this... we're stumped.

 

[benharper]

gonna try the Camshaft Position Sensor, starting to sound like that's the problem.

 

[DEMONICSHO]

i bet your grounding points for the dis are not clean enough.

 

[Mr Anonymous]

gonna try the Camshaft Position Sensor, starting to sound like that's the problem.

Nope. The CMP sensor can be disconnected and you'll still get spark.

i bet your grounding points for the dis are not clean enough.

I agree, it's either the grounds or the CKP sensor was installed improperly.

 

[benharper]

cool, I'll have him check those. Thanks guys.

 

[gbizzle27]

Could possibily be the two bolts that hold down the crossover tube. Make sure the area is cleaned well and they are tight.

 

[benharper]

Could possibily be the two bolts that hold down the crossover tube. Make sure the area is cleaned well and they are tight.

Would that cause the no spark problem?

 

[projectSHO89]

Would that cause the no spark problem?

Yes. Those two bolts provide the electrical ground that is needed for the DIS module to wok. No ground for the DIS module = no ignition.

Steve

 

[DEMONICSHO]

do you guys possibly have a pic of the crossover tube, or could please explain where it is? and is it possible for the ground to be dirty and not perform up to spec or would you just definately get no spark at all?

 

[SHObill]

The crossover tube connects the frt & rear manifold/intake tanks on the pass side/frt of engine(=frt 60K).DIS attaches to it. Just run a ground wire from the rear lower DIS mount to the firewall where the other grounds attach on the pass side. Make sure those are all clean & tight! I run a permanent ground wire there. That way you do not have to rely on the ground path from different materials of the cast aluminium tanks,steel brkts & bolts! Esp if you have powercoating/painted parts! I keep my DIS module spaced away from the hot manifold as it produces less heat than the manifold does. Its actually a silly place to mount it esp on an MTX!

 

[benharper]

Yes. Those two bolts provide the electrical ground that is needed for the DIS module to wok. No ground for the DIS module = no ignition.

Steve

durr... Sorry, I had a blonde moment. I forgot the DIS mounts to the crossover tube.

 

[Paul]

You took it to the wrong guy.

 

[MorpheusGPR]

Can you post photos of your ground wire setup?

 

[dpsutphin]

Also have him check the ground wire in the back passenger side that attaches to the intake bolt. It is easy to forget to reattach it, especially if you are in a hurry to reassemble everything.

If he did a full 60K, most anything that would cause a no spark would have been replaced. Unless one of the parts was defective, most likely something is not grounded properly, or not connected properly.

Also, check the wires that connect the throttle position sensor, they can sometimes get stretched too far, or crimped in a way that causes the problem you describe.

Good Luck

 

[benharper]

Can you post photos of your ground wire setup?

me? or Shobill?

 

[SHObill]

I'm sure He refers to my DIS ground wire I use. I will see if I can get a pic up later. Simple-just run a wire with crimped lugs on each end from the rear lower DIS mount(between DIS & crossover tube) to the firewall. Add spacers to other 3 DIS mounts to create an even air space between DIS & intake crossover. As long as DIS is grounded you can put it almost anywhere. Like Tom did on the 'Other Women'.

 

[93rev2sev]

I thought that the x-over tube acted as a heatsink and premature failure is predicted if the DIS is not allowed to dissipate heat...isn't that why you get dielectric grease when you buy a DIS?

 

[93rev2sev]

Bill, I just read that other post:
http://www.shoforum.com/showthread.php?t=70163

Got to thinking. I guess the back of the DIS is a heatsink in itself. Transistors and other electronic components can get VERY hot (take it from a computer overclocker from way back) much hotter than the intake manifold. So while I agree that the DIS is probably safe from immediate burnout, I DO think that the intake manifold helps cool the DIS.