Need help in Houston, Hot Start Problem !
03-22-2004, 07:25 PM
#19
Race Director
Originally posted by g5nad
Changed the check valve and verified that it holds pressure.
Changed the check valve and verified that it holds pressure.
You should be able to find something reasonably cheap that will shield your fuel lines. For a few bucks it's worth trying.
03-22-2004, 08:36 PM
#21
Track Day
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Location: Houston, Texas - Galleria Area
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So the vapor lock can have something to do with the no spark problem also ? When I did a spark check at the coil I only have spark when engine is cold. Very strong spark, and ofcourse the car starts right up. After the engine warms up a little - to the point where the guage shows 1/2 temp, I can still shut the car off and it will restart just fine. Once I start the car up and take it for a spin and run it up real good, park it check the temp guage to read about little over half, just about when the fans kick on to start the cooling cycle - I shut the engine off. Wait about 3-5 mins for everything to stop ( radiator fans, turbo pump ). Then I try to restart while engine is still warm ( this has been only about 5 mins ) I get a no start ! Ok, so I check the spark at the coil - and now I have no spark ! what the h@ll ! - Another thing that I do notice from time to time is a random slight idle fluction. Otherwise the freaking car runs great ! Especially after I cleaned out the DME contact connections ! It just will not start when HOT ! Can someone tell me again why I love these cars ?
03-22-2004, 09:14 PM
#26
Race Director
Yeah, I missed the no spark part.
Cap & rotor are reasonably cheap to replace. I'd guess coil though. Is the 951 coil the same as an early 944? If so, I'd be happy to let you borrow mine.
Cap & rotor are reasonably cheap to replace. I'd guess coil though. Is the 951 coil the same as an early 944? If so, I'd be happy to let you borrow mine.
03-22-2004, 09:57 PM
#28
Race Director
Originally posted by mikl1976
he already replaced the coil though
he already replaced the coil though
Shoot this is perplexing.
Let's see if I understand this correctly....
When it won't start, there is power to the coil, but the coil isn't coiling (no spark).
If this is true, if there is power to the coil but there is not spark, how can it not be the coil? Yes, I know, it's been replaced. Did I miss something else?
03-22-2004, 10:26 PM
#29
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Yea that sounds about right, when it warms up the coil does not throw out spark ? The black lead shows power on ignition and the green lead shows a weird on off blinking type of power while cranking. ( Keep in mind this is when the engine is warm ) After trying it again and again I noticed that sometimes the green lead does not give a consistent on off power. Sometimes it shows a blinking power and sometimes it does not. Sometimes it sends signal and misses a couple sequences. I know that explanation sucked ..... How else to explain ? Its weird ! Could it be the speed sensors ? How can I test them ? Do both have to work to start the car ? Could they work when cold and then stop working when they heat up ? Could it be possible that the spacing to the flywheel is to far and when the bellhousing expands when it heats up it moves the sensors to far away from the flyweel trigger? I know for almost sure that I verified the spacing to be correct when I did the clutch job. How could I test the sensors or the lead to the sensor to be functioning correctly ?
). Gotta think about that a bit.