Need Help diagnosing a miss. - Ford Mustang Forums
 
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post #1 of 5 (permalink) Old 02-03-2013 Thread Starter
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Need Help diagnosing a miss.

Hello all, I have lurked on here for years... hate to join with a problem but it is what it is...I am having an ongoing problem for the last few weeks of a random miss on my car. i have changed the following parts and done the following tests.

new...Fuel filter, pv valve, plugs, wires, cap, rotor, maf, coil, IAC, and TPS.

I have done a key on engine running test and KOEO test and only gotten an EGR code. EGR is deleted but haven't had the car tuned yet. Car has is idling around 26 on the vacuum gauge. also have replaced most all the vacuum lines and cannot find a leak anywhere.

Only things im down to now would be TFI and Hall effect sensor but my work schedule this week is gonna limit my time for a few days and i'll just have to drive it and deal with it.

It will randomly miss/cut out feels like it is dropping a cylinder. Started doing this not too long ago after doing perfect for 2 of the 3 months i have owned it. I bought it stone stock figuring it would be good for a daily as it has been averaging around 22-23 mpg. I am still happy with the car but want to figure this out...

another odd thing i have noticed since this problem arose is that when starting the car the tach jumps up and down a lot... almost to 1k and i know that starter isn't turning the motor over that fast...lol.

open to suggestions on other stuff to check for so i have a list to go down on my next off day. Thanks for any help in advance.

Jason
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post #2 of 5 (permalink) Old 02-03-2013
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Could be the crankshaft position sensor or the camshaft position sensor

2007 GT - BBK CERAMIC LT HEADERS, BBK X PIPE, FLOWMASTER MUFFLERS, C&L STREET CAI, BBK 62MM TB, BAMA 91 TUNE
:kooky:I put down 600hp to the rear wheel in my dreams, when I wake up, theres a strange sticky liquid in my pants.
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post #3 of 5 (permalink) Old 02-03-2013 Thread Starter
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It's a 93, don't believe i will find those on this car.
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post #4 of 5 (permalink) Old 02-04-2013
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The Tach signal comes from the ICM (tfi) so I guess that would be a place to start.Testing the tfi is an option ,but I personally have questions on the reliability of test methods.Its possible the tfi tach output signal can be affected by the PIP along with causing the random miss, but with the ease of the tfi replacement,I think I'd start with it.
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post #5 of 5 (permalink) Old 02-04-2013 Thread Starter
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That is actually the plan.... start with TFI and go to the PIP. Car actually let out a big backfire today... kinda crazy... lol has to be timing related.. has not done that before.
BTW ... thanks for the help.
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