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92 Dodge Stealth DOHC Two Cyl no spark. PTU Tests Okay.


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Uniqauto
User

Nov 18, 2012, 8:58 AM

Post #1 of 21 (2384 views)
  post locked   92 Dodge Stealth DOHC Two Cyl no spark. PTU Tests Okay.  

Hi. Working on my son's 92 Dodge Stealth ES 3.0 DOHC fwd. Two cyls have no spark. Tried new and moving coils; no spark follows power wire to one of coil positions. Tried new ECU from eBay.
Finally, I carefully followed the on-line testing procedure for Power Transistor Unit and was surprised that it appears to check out okay. Now thinking:
I've made an error in testing the PTU.
Or there is a break in the wire powering the bad coil position (seems unlikely)

Any ideas before I assume PTU is bad and spend $50 on a used one?
This appears to be a known problem.

Thanks much,

Jim


Discretesignals
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Nov 18, 2012, 9:11 AM

Post #2 of 21 (2370 views)
  post locked   Re: 92 Dodge Stealth DOHC Two Cyl no spark. PTU Tests Okay.  

Which cylinders have no spark?





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Uniqauto
User

Nov 18, 2012, 10:27 AM

Post #3 of 21 (2340 views)
  post locked   Re: 92 Dodge Stealth DOHC Two Cyl no spark. PTU Tests Okay.  

Don't recall and not at car. I'll get that info asap in the next day or two. Out of town now.

I do know it was the two cyl coming off which ever coil I ran the dead power wire to.. (ie I could move the problem around) originally the centre coil, I believe.

Thanks for reply.


Discretesignals
Ultimate Carjunky / Moderator
Discretesignals profile image

Nov 18, 2012, 12:33 PM

Post #4 of 21 (2330 views)
  post locked   Re: 92 Dodge Stealth DOHC Two Cyl no spark. PTU Tests Okay.  

Kind of hard to help you if your away from the vehicle. Really need to know which coil your dealing with. Plus it is hard to test things if your not at the vehicle.





Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.


Uniqauto
User

Nov 20, 2012, 3:11 PM

Post #5 of 21 (2298 views)
  post locked   Re: 92 Dodge Stealth DOHC Two Cyl no spark. PTU Tests Okay.  

I'm at the car.

It is the rear coil not firing cyl 5 and 6.


Hammer Time
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Nov 20, 2012, 4:16 PM

Post #6 of 21 (2289 views)
  post locked   Re: 92 Dodge Stealth DOHC Two Cyl no spark. PTU Tests Okay.  

There is no coil that fires 5/6

They are 1/4 2/5 3/6



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Uniqauto
User

Nov 20, 2012, 4:45 PM

Post #7 of 21 (2282 views)
  post locked   Re: 92 Dodge Stealth DOHC Two Cyl no spark. PTU Tests Okay.  

Ah. Okay pulled cover. One plug wire from dead coil goes to cyl at front of engine (and car, in this case) immediately behind camshaft pulley and left when facing engine (right head of engine itself) so #... 1?
other wire goes to either of front-most or centre cyl on other side (intake in the way).


Hammer Time
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Nov 20, 2012, 4:57 PM

Post #8 of 21 (2274 views)
  post locked   Re: 92 Dodge Stealth DOHC Two Cyl no spark. PTU Tests Okay.  





~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



Uniqauto
User

Nov 20, 2012, 5:12 PM

Post #9 of 21 (2268 views)
  post locked   Re: 92 Dodge Stealth DOHC Two Cyl no spark. PTU Tests Okay.  

Great! Thanks. So coil 1/4 is not firing.


Hammer Time
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Nov 20, 2012, 6:03 PM

Post #10 of 21 (2257 views)
  post locked   Re: 92 Dodge Stealth DOHC Two Cyl no spark. PTU Tests Okay.  

Swap it with another one and see if the miss follows it.



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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



Uniqauto
User

Nov 20, 2012, 6:14 PM

Post #11 of 21 (2250 views)
  post locked   Re: 92 Dodge Stealth DOHC Two Cyl no spark. PTU Tests Okay.  

As in my original post, I've done that and it follows the power lead to the coil. This apparently suggests on the dohc 3.0 that the Power Transistor is bad. Thing is, followed the procedure to bench-test the PTU and it checked out, oddly.


Hammer Time
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Nov 20, 2012, 6:16 PM

Post #12 of 21 (2246 views)
  post locked   Re: 92 Dodge Stealth DOHC Two Cyl no spark. PTU Tests Okay.  

That test won't tell you if one driver is burnt out.



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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



Uniqauto
User

Nov 20, 2012, 6:23 PM

Post #13 of 21 (2242 views)
  post locked   Re: 92 Dodge Stealth DOHC Two Cyl no spark. PTU Tests Okay.  

A driver being internal to the ptu? ie you think the ptu is likely bad?


Hammer Time
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Nov 20, 2012, 6:26 PM

Post #14 of 21 (2237 views)
  post locked   Re: 92 Dodge Stealth DOHC Two Cyl no spark. PTU Tests Okay.  

Yes, I do. The driver is the grounding transistor that actually operates that coil from within the module, assuming the wiring between them is good.



~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



Uniqauto
User

Nov 20, 2012, 7:30 PM

Post #15 of 21 (2225 views)
  post locked   Re: 92 Dodge Stealth DOHC Two Cyl no spark. PTU Tests Okay.  

Huh! Interesting. I re-read the test. So the unit has both grounding transistors and power transistors? If so, bummer that this test isn't conclusive, ie tests everything in the unit or doesn't point that out (!).

Is it realistic to attempt a repair of the bad transistor in the unit; I have an electronics wizard friend.

Either way, thanks a lot for your time. Can I compensate you or donate to something on your behalf? Getting my boy's car going will make him a happy guy, there being no better satisfaction for a Dad. He likes this sometimes troublesome car and that's what matters. :-)


Hammer Time
Ultimate Carjunky / Moderator
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Nov 20, 2012, 7:34 PM

Post #16 of 21 (2220 views)
  post locked   Re: 92 Dodge Stealth DOHC Two Cyl no spark. PTU Tests Okay.  

No, we all volunteer our time here to help people out.
I don't think repairing that is an option. They are encased in a gel and getting a schematic would be impossible.



~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



Uniqauto
User

Nov 20, 2012, 7:47 PM

Post #17 of 21 (2214 views)
  post locked   Re: 92 Dodge Stealth DOHC Two Cyl no spark. PTU Tests Okay.  

Roger. Well thank you!

There was a used PTU available online last time I looked. It'll take as much as a few weeks but I'll let you know how we make out.


Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

Nov 20, 2012, 7:51 PM

Post #18 of 21 (2210 views)
  post locked   Re: 92 Dodge Stealth DOHC Two Cyl no spark. PTU Tests Okay.  

Be careful with that stuff. You can be burned real easy. I don't like used electronics.



~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



Uniqauto
User

Nov 21, 2012, 1:06 PM

Post #19 of 21 (2195 views)
  post locked   Re: 92 Dodge Stealth DOHC Two Cyl no spark. PTU Tests Okay.  

Yep, I hear you.

Just got your reply and have since ordered a used one off eBay. I'm in Canada, cheapest new was $212.
Hoping for the best and will chaulk it up to experience if not.
Can you recommend a jobber for this kind of stuff that ships here?

Jim


Uniqauto
User

Dec 12, 2012, 8:58 PM

Post #20 of 21 (2096 views)
  post locked   Re: 92 Dodge Stealth DOHC Two Cyl no spark. PTU Tests Okay.  

Received used PTU from N. Carolina and it has solved the problem! Car runs on 6 cyl again. When I told my boy, who is away at school, he said he was bouncing off the walls.

Thanks for your help and patience.
Jim


Hammer Time
Ultimate Carjunky / Moderator
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Dec 13, 2012, 4:04 AM

Post #21 of 21 (2083 views)
  post locked   Re: 92 Dodge Stealth DOHC Two Cyl no spark. PTU Tests Okay.  

You're welcome, glad you found your problem.

Question now closed as solved.



~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.







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