1992 intermittent starting issue - Ford Mustang Forums : Corral.net Mustang Forum
 
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post #1 of 19 Old 06-08-2015, 05:05 PM Thread Starter
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1992 intermittent starting issue

I'm looking at buying a 1992 LX 5.0L convertible. But it is having a starting issue most of the time starts first time but recently sometimes doesn't start at all pump is priming there's pressure in the lines. Some one suggested the ecm might need to be repaired or replaced any suggestions?

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post #2 of 19 Old 06-08-2015, 08:26 PM
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so it cranks

and won't start sometimes?

cold, hot?


89 GT gr-40, KB2200(10psi), tweecer R/T,LC-1, 22gal cell, w/tailpipes.
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post #3 of 19 Old 06-08-2015, 09:27 PM Thread Starter
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It's. Starts after cranking it 4 or 5 times only once it didn't start and waited like an hr and it started. It happens sometimes in the morning also after its been running and u stop some where for 10-20 mins
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post #4 of 19 Old 06-08-2015, 09:52 PM
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there is

CRANK no start

and no crank

if this is a crank no start, you are missing one or more

spark proper time

fuel proper time

compression

start with spark

again

does it do it warm, hot or cold???

no idea what "morning' or '10-20mins' is

be specific

89 GT gr-40, KB2200(10psi), tweecer R/T,LC-1, 22gal cell, w/tailpipes.
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post #5 of 19 Old 06-08-2015, 10:39 PM Thread Starter
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It does it hot it does it cold.
It does not turn over on the first time like it used to I have to crank it 3 or 4 times before it turns over and starts so it's getting worst. Sorry if I'm doing a bad job explaining
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post #6 of 19 Old 06-08-2015, 11:42 PM
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put a fuel pressure gauge on the rail, and record what the pressure is at crank.

3-4 revs,,,,is NOT a problem.

89 GT gr-40, KB2200(10psi), tweecer R/T,LC-1, 22gal cell, w/tailpipes.
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post #7 of 19 Old 06-09-2015, 12:18 AM Thread Starter
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It's 35psi
First crank revs 5-6 times so I stop and recrank revs 5-6 times then might start the third crank or do the same and start on the 4th crank
Could it be a pip sensor?
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post #8 of 19 Old 06-09-2015, 12:22 AM
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no pip will be no start

you have a start, just long crank

your pressure should be near 40psig.

if you want to test pip.

use a dvom, and test pip, should be around 4volts at crank.

89 GT gr-40, KB2200(10psi), tweecer R/T,LC-1, 22gal cell, w/tailpipes.
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post #9 of 19 Old 06-09-2015, 12:51 AM Thread Starter
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Also I have realized it's been hot here like 30 degrees so it's been happening when its hot
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post #10 of 19 Old 06-09-2015, 01:22 AM Thread Starter
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Any suggestions if not the pip

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post #11 of 19 Old 06-09-2015, 09:09 AM
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pip is good

fuel pressure is good

you are good to go

89 GT gr-40, KB2200(10psi), tweecer R/T,LC-1, 22gal cell, w/tailpipes.
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post #12 of 19 Old 06-10-2015, 10:14 AM
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my sons car did this. replaced tfi module and pip still acted up. ended up being ecm. took cover off had a burnt spot on the circuit board.
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post #13 of 19 Old 06-10-2015, 07:50 PM
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long crank from a bad ecm?

don't see it.

89 GT gr-40, KB2200(10psi), tweecer R/T,LC-1, 22gal cell, w/tailpipes.
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post #14 of 19 Old 06-10-2015, 11:06 PM Thread Starter
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Ok so tfi been replaced swapped a distributor to check to see if it was the pip sensor still didn't solve the problem 40psi fuel pressure and holds at 35 when cranking
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post #15 of 19 Old 06-10-2015, 11:30 PM
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you just like changing parts?

89 GT gr-40, KB2200(10psi), tweecer R/T,LC-1, 22gal cell, w/tailpipes.
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post #16 of 19 Old 06-10-2015, 11:46 PM Thread Starter
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If it will help rule out things yes
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post #17 of 19 Old 06-10-2015, 11:55 PM
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of course, its only time and money.

but does not make you any better and diagnosing.

89 GT gr-40, KB2200(10psi), tweecer R/T,LC-1, 22gal cell, w/tailpipes.
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post #18 of 19 Old 06-12-2015, 02:13 AM Thread Starter
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That's why I was asking for help and clearly your suggestions didn't help and thanks dragking it was the ecm
Indy2000 as I said from the beginning it was a car I was looking to buy so these were things that were switched out by the current owner
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post #19 of 19 Old 06-14-2015, 10:59 PM
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glad you found it. sometimes it takes a few replacement parts to figure it out, especially parts that are known to be problematic like tfi.
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