very hard start/miss
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Posting Guru
Joined: Jan 2001
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From: Nebraska
very hard start/miss
Hey guys, I need a little help with an 01 F-250 I'm working on. It's having starting issues anytime it's sat overnight. It takes lots of cranking before it takes off running. One cooler (~50 degrees) morning I couldn't get it going at all. Once it does run, it's got a definate miss until it warms up. Then it'll come out of it and start and run perfect the rest of the day.
I don't think it's a GP issue. GPR is working and I tested GP's with a test light (I know...I should check resistances). I've got a Snap-on scanner and ICP looks to be in spec even when it won't start. HPO level is down about an inch (this is okay right?).
It had all kinds of codes so I cleared them to start fresh, and none have showed back up yet. Buzz test passed. I couldn't get it to run a cylinder contribution test for some reason.
Any ideas of what else to check?
I don't think it's a GP issue. GPR is working and I tested GP's with a test light (I know...I should check resistances). I've got a Snap-on scanner and ICP looks to be in spec even when it won't start. HPO level is down about an inch (this is okay right?).
It had all kinds of codes so I cleared them to start fresh, and none have showed back up yet. Buzz test passed. I couldn't get it to run a cylinder contribution test for some reason.
Any ideas of what else to check?
Hotshot
Joined: Aug 2006
Posts: 10,764
Likes: 39
Hey guys, I need a little help with an 01 F-250 I'm working on. It's having starting issues anytime it's sat overnight. It takes lots of cranking before it takes off running. One cooler (~50 degrees) morning I couldn't get it going at all. Once it does run, it's got a definate miss until it warms up. Then it'll come out of it and start and run perfect the rest of the day.
I don't think it's a GP issue. GPR is working and I tested GP's with a test light (I know...I should check resistances). I've got a Snap-on scanner and ICP looks to be in spec even when it won't start. HPO level is down about an inch (this is okay right?).
It had all kinds of codes so I cleared them to start fresh, and none have showed back up yet. Buzz test passed. I couldn't get it to run a cylinder contribution test for some reason.
Any ideas of what else to check?
I don't think it's a GP issue. GPR is working and I tested GP's with a test light (I know...I should check resistances). I've got a Snap-on scanner and ICP looks to be in spec even when it won't start. HPO level is down about an inch (this is okay right?).
It had all kinds of codes so I cleared them to start fresh, and none have showed back up yet. Buzz test passed. I couldn't get it to run a cylinder contribution test for some reason.
Any ideas of what else to check?
Postmaster
Joined: Dec 2008
Posts: 3,340
Likes: 2
If you are not getting any codes maybe fuel related....Just an idea....How many miles... Injectors?
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Thread Starter
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Posting Guru
Joined: Jan 2001
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From: Nebraska
Around 210,000 miles. Injectors or fuel were a couple of my thoughts also. Two injectors recently were replaced. The others haven't been touched.
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Thread Starter
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Posting Guru
Joined: Jan 2001
Posts: 2,358
Likes: 3
From: Nebraska
I worked with it almost all morning and came up with a few things. Started it up and the SES light came on, then went off. Checked codes, P1316, which is IDM codes. Ran the buzz test and got P1271 and P1276. I checked all injector resistances at the VC connectors, all under 5 ohms but not shorted. Checked wiring from the VC connectors to the IDM, and have continuity on all pins.
I'm leaning towards a bad IDM, for the codes and miss anyway. But can this cause a hard start?
I'm leaning towards a bad IDM, for the codes and miss anyway. But can this cause a hard start?
Postmaster
Joined: Dec 2008
Posts: 3,340
Likes: 2
P1271 High to Low Side Open - Cylinder 1
P1276 High to Low Side Open - Cylinder 6
I would swap those injectors and see if it follows.
Does not seem like a typical idm failure.
You can idle it with the valve covers off and see which one are spouting oil.
P1276 High to Low Side Open - Cylinder 6
I would swap those injectors and see if it follows.
Does not seem like a typical idm failure.
You can idle it with the valve covers off and see which one are spouting oil.
