rough idle on start up and deceleration - Ford Powerstroke Diesel Forum
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post #1 of 11 Old 09-19-2011, 01:36 PM Thread Starter
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rough idle on start up and deceleration

noticed that my new to me truck on start up has a rough idle for a few seconds. then if you rev up engine to around 1200-1500 rpm when gets back to around base idle it runs rough as well,

driving down road drives like a champ no missing or chugging??

things i've checked and done, removed exhaust back pressure sensor had some build up cleaned out and the tube.

for giggles replaced cam sensor with spare one i had in glove box ( new from ford)

did the "famous" ford tap test on multiple parts and wiggled harnesses.???

kinda pissing me off

96 f250 4x4 zf5 trans. 6637 air filter mod.
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post #2 of 11 Old 09-21-2011, 07:52 AM Thread Starter
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96 f250 4x4 zf5 trans. 6637 air filter mod.
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post #3 of 11 Old 09-21-2011, 08:13 AM
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Check the fuel pressure?

97 F350 CCLB 4x4 PSD
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post #4 of 11 Old 09-21-2011, 02:09 PM Thread Starter
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sure did it was fine. checked it after i replaced the fuel filter (pm) so dunno but is kinda making me upset. drives me crazy.. no codes no check engine light??

96 f250 4x4 zf5 trans. 6637 air filter mod.
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post #5 of 11 Old 09-21-2011, 02:17 PM
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disconnect your ICP sensor see if there's oil in it. Also start the truck while it's disconnected, see if your idle smooths out

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post #6 of 11 Old 09-21-2011, 02:50 PM Thread Starter
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disconnect your ICP sensor see if there's oil in it. Also start the truck while it's disconnected, see if your idle smooths out
found a little bit of oil in it, so guess i need to replace. but did not help running condition, actually got worse on try to accelerate when that was unplugged.

96 f250 4x4 zf5 trans. 6637 air filter mod.
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post #7 of 11 Old 09-21-2011, 03:39 PM
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scanner time......

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post #8 of 11 Old 09-21-2011, 04:32 PM Thread Starter
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scanner time......
i've got a snap on scanner, ran a code check and none, history had a exhaust backpressure sensor code cleared it out, once i seen that code i did removed sensor and cleaned both the sensor and tube wasn't completely clogged but did have some build up

ran a buzz test all 8 buzz the same and strong, ran cylinder contribution test and passed

what do i need to look for on scanner any certain values?

thanks in advance.

96 f250 4x4 zf5 trans. 6637 air filter mod.
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post #9 of 11 Old 09-22-2011, 09:48 AM Thread Starter
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ok so today i decided to check out some things, figured i would check the oil level noticed it was low again (noticed this too once i purchased) so now i believe that maybe i have an injector seal leaking and thats whats causing this issue.. anyone to check to see which one it is without having to remove them all? i do have a snap on mt2500 scanner, I really don't want to take to the local stealership.. thanks in advance.

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post #10 of 11 Old 09-22-2011, 09:55 AM
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Ipr duty cycle, HPOP psi at start and idle,

check your fuel filter for signs of oil. If it has any, you have leaky orings.

Also check your fuel pressure.

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