Crank but no start
02-07-2009, 09:21 PM
#31
Rennlist Member
Thread Starter
Hi Mason - no ether - in fact the CE panel is out (see the reference thread above in my last post). I've got issues there to clean up.
As to parts, my crank sensor is new as of last winter during the intake R&R, and my MAF was cleaned and inspected then and has never been a problem. Don't think it would just fail while the car was sitting on jack stands for a few weeks without being started. Could be a fuel pump issue tho, since it was humming awhile back. If it's the wiring problem as described in my other thread, then my question remains as to wether the engine would sound and feel like it wants to start without catching if the starter were the issue? When my last starter died, there was just a clicking sound then silence. This "no start" isn't working that way.
As to parts, my crank sensor is new as of last winter during the intake R&R, and my MAF was cleaned and inspected then and has never been a problem. Don't think it would just fail while the car was sitting on jack stands for a few weeks without being started. Could be a fuel pump issue tho, since it was humming awhile back. If it's the wiring problem as described in my other thread, then my question remains as to wether the engine would sound and feel like it wants to start without catching if the starter were the issue? When my last starter died, there was just a clicking sound then silence. This "no start" isn't working that way.
02-08-2009, 05:16 AM
#32
Rennlist Member
Hi Mason - no ether - in fact the CE panel is out (see the reference thread above in my last post). I've got issues there to clean up.
As to parts, my crank sensor is new as of last winter during the intake R&R, and my MAF was cleaned and inspected then and has never been a problem. Don't think it would just fail while the car was sitting on jack stands for a few weeks without being started. Could be a fuel pump issue tho, since it was humming awhile back. If it's the wiring problem as described in my other thread, then my question remains as to wether the engine would sound and feel like it wants to start without catching if the starter were the issue? When my last starter died, there was just a clicking sound then silence. This "no start" isn't working that way.
As to parts, my crank sensor is new as of last winter during the intake R&R, and my MAF was cleaned and inspected then and has never been a problem. Don't think it would just fail while the car was sitting on jack stands for a few weeks without being started. Could be a fuel pump issue tho, since it was humming awhile back. If it's the wiring problem as described in my other thread, then my question remains as to wether the engine would sound and feel like it wants to start without catching if the starter were the issue? When my last starter died, there was just a clicking sound then silence. This "no start" isn't working that way.
02-08-2009, 11:52 AM
#34
Rennlist Member
Thread Starter
Chris - it is, that is why I had the question above in post #29 ("...In other words, if a starter were the issue, whether because it's bad or cut-off due to an alarm override or whatever, would the engine still turn as if it wanted to fire?").
This is what has me puzzled. Even if the melted wire jumble that was staked into Q13 connector is red herring for purposes of my "no start" problem, I still needed to fix it for other reasons.
This is what has me puzzled. Even if the melted wire jumble that was staked into Q13 connector is red herring for purposes of my "no start" problem, I still needed to fix it for other reasons.
02-08-2009, 03:07 PM
#35
Rennlist Member
Well I'm back at it - I have spark on both sides, so probably not the coil, but I've got one on order from Roger anyway. I may have discovered the problem - see this thread: https://rennlist.com/forums/928-foru...-meltdown.html
The question is, if this is due to an after-market alarm issue or similar issue involving the starter, would the car turn over nice and strong anyway even though it doesn't actually start? In other words, if a starter were the issue, whether because it's bad or cut-off due to an alarm override or whatever, would the engine still turn as if it wanted to fire?
(additional background - my starter was replaced last summer by a very trusted Porsche mechanic in Pittsburgh; it's new).
The question is, if this is due to an after-market alarm issue or similar issue involving the starter, would the car turn over nice and strong anyway even though it doesn't actually start? In other words, if a starter were the issue, whether because it's bad or cut-off due to an alarm override or whatever, would the engine still turn as if it wanted to fire?
(additional background - my starter was replaced last summer by a very trusted Porsche mechanic in Pittsburgh; it's new).
02-10-2009, 01:10 AM
#37
Rennlist Member
Thread Starter
On ice for awhile now Chris, as I got wrapped in the ce panel R&R job, and while it's all open, want to do a couple of other small things. I'll revive this thread as soon as I get back after it.
02-10-2009, 01:11 AM
#38
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Not sure if this will help in this case. What I found with my crank but no start was the fuel injector wiring at cylinder 8 was shorted together. All cylinders are single batch fire, so if one shorts, none of the injectors fire. Louie pointed that out to me. I fixed it by wiring in new injector plug with pig tail.
Tony
1986.5 928 Black Track Car
Tony
1986.5 928 Black Track Car
03-29-2009, 12:56 AM
#40
Rennlist Member
Thread Starter
WooHoo - fired up today. Alot of white smoke at first, then it smoothed out and ran fine. I let it run for quite some time before shutting down. I then started it up a few more times after that to make sure I wasn't dreaming. 
Prognosis - could have been a number of things, but I think it was just the ground wire at the engine on the underside of the car.
If you look at my original post, you'll see the only thing I did was to clean the underside real well with simple green and water. After that, it didn't start. I chased alot of things - got a new coil and coil wire (my spark had seemed weak, and I had removed the prior coil while taking off the power steering reservior), I switched out relays, chased down vacume leaks from having the engine bay apart for other R&R work, and did some other stuff, but nothing worked until I cleaned the ground wire, and viola! Hard to imagine that damn wire could be the culprit, and I may never know for sure, but I think it was.
Anyway, while it was down and out (and me too with emergency gall bladder surgery to put it all on hold for awhile), I did a complete CE panel R&R as well as the blower box and fan R&R, including eliminating a water leak in that area. I had found some nasty splicing at the panel, and I cleaned most of the crap out, resoldered wires and put it all back together. The airbox/fan was a pain in the rear, but the write ups here on Rennlist and other sites (Sharksin is my hero, and Dwayne too) allowed me to takle these other projects - more stuff works better now, and the car fires right up.
Thanks all for the tips throughout this thread!
Prognosis - could have been a number of things, but I think it was just the ground wire at the engine on the underside of the car.
If you look at my original post, you'll see the only thing I did was to clean the underside real well with simple green and water. After that, it didn't start. I chased alot of things - got a new coil and coil wire (my spark had seemed weak, and I had removed the prior coil while taking off the power steering reservior), I switched out relays, chased down vacume leaks from having the engine bay apart for other R&R work, and did some other stuff, but nothing worked until I cleaned the ground wire, and viola! Hard to imagine that damn wire could be the culprit, and I may never know for sure, but I think it was.
Anyway, while it was down and out (and me too with emergency gall bladder surgery to put it all on hold for awhile), I did a complete CE panel R&R as well as the blower box and fan R&R, including eliminating a water leak in that area. I had found some nasty splicing at the panel, and I cleaned most of the crap out, resoldered wires and put it all back together. The airbox/fan was a pain in the rear, but the write ups here on Rennlist and other sites (Sharksin is my hero, and Dwayne too) allowed me to takle these other projects - more stuff works better now, and the car fires right up.
Thanks all for the tips throughout this thread!
