Engine Missing when Cold? - Ford Powerstroke Diesel Forum
 
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post #1 of 10 Old 10-01-2013, 12:51 PM Thread Starter
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Engine Missing when Cold?

1995 7.3L, Manual Trans. I have had this truck for 2 years, and since I've had it, it has a skip in the engine until it reaches operating temp. Then it's like an injector starts working or something starts working. It runs perfectly after it gets to operating temp. If it sits for 5-6 hours and gets cold, it skips until warm again. I assume it has a bad injector but I don't understand why it would start working when the truck warmed up? I had a local diesel mech turn each injector off and the engine ran like crap each time he turned one off, but the truck was warm and running right at the time. Just looking for some good input here guys. Thanks.

1995 F250 ECLB ZF5 4X4:
3" DP to 4" Exhaust
Tymar Intake
CCV Mod
Valair Clutch
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post #2 of 10 Old 10-01-2013, 03:34 PM
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If the skip/miss does not sound/feel the same as when the mechanic intentionally disabled an injector, that's probably not the issue. More likely it's the PCM not "realizing" the engine is cold. Did the mechanic put the truck on a scanner and check any real-time data from any of the sensors? Of the top of my head, I'd say the thing to look for is EOT - engine oil temp, but look at it while the engine is cold.

You're not hearing an additional "whoosssshhh" sound while this is happening, are you?
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post #3 of 10 Old 10-02-2013, 05:51 AM Thread Starter
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like the EBPV being closed? No, I'm not hearing any sounds like that. He didn't check any real time data as far as I know. I was just over there talking to him and he plugged it up real quick and checked the injectors. So the PCM could be causing it to run like that when not at operating temp?

1995 F250 ECLB ZF5 4X4:
3" DP to 4" Exhaust
Tymar Intake
CCV Mod
Valair Clutch
Gauges
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post #4 of 10 Old 10-02-2013, 06:00 AM
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Not the PCM itself (although that's possible), but one of the sensors giving a bad reading.
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post #5 of 10 Old 10-02-2013, 06:03 AM Thread Starter
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I could probably just take it to Ford and have them do some in depth testing on it.. I just don't want to spend a bunch of money on tests and have them tell me they're stumped.

1995 F250 ECLB ZF5 4X4:
3" DP to 4" Exhaust
Tymar Intake
CCV Mod
Valair Clutch
Gauges
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post #6 of 10 Old 10-02-2013, 06:09 AM
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If your local mechanic has a scanner or software that will communicate with our trucks, he could do the same, for prob. a lot less than the dealer. Or maybe there's a member on this or one of the other forums who's nearby you, and could hook it up and take a look.
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post #7 of 10 Old 10-02-2013, 06:14 AM Thread Starter
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yeah maybe. I just have a really hard time trusting any local mechanic, and even a dealer to work on any diesel vehicle. I haven't had good luck in the past with them.

1995 F250 ECLB ZF5 4X4:
3" DP to 4" Exhaust
Tymar Intake
CCV Mod
Valair Clutch
Gauges
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post #8 of 10 Old 10-02-2013, 06:21 AM
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Well, you can get Autoenginuity and an old beater laptop, or an Aeroforce Intercepter, and hook it up yourself. If you're primarily DIY, just consider it another tool.
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post #9 of 10 Old 10-15-2013, 09:19 AM
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I have a 96 F350 that does the same thing. Thought it was a dead injector (did the unplugging of each injector while running) so I got another one. Changed it out but still get the same thing...rough/missing idle and the sort until it's warm. Once there, it's perfect and purrs like a kitten. new injector seems to make no difference as it too will make no engine change when unplugged. Also changed the UVCH and gasket.
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post #10 of 10 Old 10-15-2013, 12:18 PM Thread Starter
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Yeah, mine is still doing it after the Ford dealership cleaned the fuel system. (something that dude thought would certainly fix it). If it's not an injector I wonder what it is...

1995 F250 ECLB ZF5 4X4:
3" DP to 4" Exhaust
Tymar Intake
CCV Mod
Valair Clutch
Gauges
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