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| 87gt cranking not turning over? (Page 1/6) |
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Dwayne
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DEC 30, 04:46 PM
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my son's 87gt won't start so he called me. it cranks fine just doesn't even try to turn over. ran great till then. I started looking into it and so far I got about 45psi at fuel rail. and pulled a plug laid it on intake and got spark. next I placed cyl #1 at tdc and checked for roter at plug wire 1 position. any Ideas on where to go from here.
thanks, Dwayne
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Mike in Sydney
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DEC 30, 05:07 PM
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Spadesluck
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DEC 30, 06:51 PM
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Start simple. Ignition module is the simple fix for sure.You checked fuel. Try checking if you got spark as well.
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Gall757
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DEC 30, 08:26 PM
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The extra easy test is to crank the starter and look at the tachometer. IF the needle moves, the ICM is working. If it does not....replace the ICM. [This message has been edited by Gall757 (edited 12-30-2019).]
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olejoedad
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DEC 30, 08:44 PM
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| quote | Originally posted by Dwayne:
my son's 87gt won't start so he called me. it cranks fine just doesn't even try to turn over. ran great till then. I started looking into it and so far I got about 45psi at fuel rail. and pulled a plug laid it on intake and got spark. next I placed cyl #1 at tdc and checked for roter at plug wire 1 position. any Ideas on where to go from here.
thanks, Dwayne |
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He has spark.
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Patrick
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DEC 30, 08:49 PM
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| quote | Originally posted by Dwayne:
...pulled a plug laid it on intake and got spark.
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Jumping a few thousands of an inch at atmospheric pressure means next to nothing. A healthy spark will easily jump a quarter inch gap outside of the combustion chamber.
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Dwayne
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DEC 30, 11:32 PM
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will try to check the icm and place a spark tester on plug wire to check strength of spark. the tachometer is moving as well when cranking. thanks
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creaky78
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DEC 31, 11:42 AM
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Patrick is correct. A weak ignition system can produce spark when plug is inserted into the wire and grounded. When the plug is in the engine compression will not allow the weak system to produce a spark due to the high pressure between the plug electrodes. Also check the coil https://www.youtube.com/watch?v=xmdS4vGB-m8
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ltlfrari
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DEC 31, 03:49 PM
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You need spark (in the cylinder) and fuel to run.
Use one of those transparent inline spark testers to see if you have spark. Put between coil and dist center.
Throw some starting fluid down it's throat.
If it at least fires and you've got spark then it's fuel, no spark can be ignition module or coil. ICM is most likely. I've them just 'go' twice so far. Always carry a spare (and tools to swap it out) now.
However if it's electrical, it could be a bad wire or connection somewhere that's just given up the ghost!
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Anything I might say is probably worth what you paid for it, so treat it accordingly!
Dave
www.ltlfrari.com
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David Hambleton
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DEC 31, 09:29 PM
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