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Join Date: Apr 2008
Location: Cincinnati, OH
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No spark after timing belt tensioning and clutch slave cylinder bleeding

The last time I had my car running was 3 or 4 days ago, before I bled the clutch slave cylinder and re-tensioned my timing belt. The first thing I checked was spark, and found that I have none. Both procedures were pretty basic, so I'm not sure what I did.

What are the most common, or even not so common causes of no spark?

I noticed that when I'm trying to start the car, my oil pressure sensor stays on 0 and turns red. I don't remember if this is normal. Does a failing oil pressure sensor stop the car from getting spark? It seems unlikely that some component has died over the last few days, without running the car, so maybe I accidentally disconnected something?

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1986 944 N/A - Recently purchased, towed home, and not yet back on the road.
Old 06-19-2008, 06:10 PM
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When you did this, did you disconnect anything? Or just bleed the slave?
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Old 06-19-2008, 07:38 PM
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Did you have your distributor cap off? ifso did you break your rotor by accident putting things together? I did that once. ALso check your plug and coil wires all really well then i'd check your relay and fueses.
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Brian

'86 944 NA
'94 Jeep Cherokee 3" and 31's
'86 Chevy C10 425hp
'98 Dodge Neon (the wife)
Old 06-19-2008, 07:42 PM
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Quote:
Originally Posted by hpservertech View Post
When you did this, did you disconnect anything? Or just bleed the slave?
You beat me to it. Any time I have a no start or problem I always work backwards from what I 'repaired'. If the car ran fine before it has nothing to do with the clutch bleeding unless you bumped a sensor connection or something. Something got disconnected somewhere along the line during the last repair, you can bank on it.
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Old 06-19-2008, 07:44 PM
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I did not disconnect anything to bleed the slave (I left the starter attached), which is why this is so weird.

I did remove the distributor cap/cam sprocket housing during the timing belt tensioning procedure, but double-checked everything and it seems good. I put a spark tester between the coil and the cap, and got nothing, so it seems that nothing is coming from the coil
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1986 944 N/A - Recently purchased, towed home, and not yet back on the road.
Old 06-19-2008, 07:45 PM
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does your tach bounce? I had a no-spark problem another time and it turned out my speed and ref sensor connector had rotted and wasn't doin it's thing. I taped em together and it was like magic. I'd check those connections (should be along the back of the engine around the firewall) and then I'd also test your relay, I think it's the DME relay.
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Brian

'86 944 NA
'94 Jeep Cherokee 3" and 31's
'86 Chevy C10 425hp
'98 Dodge Neon (the wife)
Old 06-19-2008, 07:54 PM
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I finally got a chance to check this out again. The first thing I did was jiggle and tap what I believe to be the speed and reference sensor connectors (attached to a metal frame that bolts to the intake manifold). When I tried to start the car, it took one turn of the key, but it hesitated to start at first, then ran badly for 3 or 4 seconds once it did. After that, it ran great. I'm not sure what to make of the hesitation to start and the poor running initially, but I assume those connectors were the issue.

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1986 944 N/A - Recently purchased, towed home, and not yet back on the road.
Old 06-22-2008, 03:35 PM
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