Truck sputtering/bogging under load, I am stumped - Ford Truck Enthusiasts Forums



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Truck sputtering/bogging under load, I am stumped

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Old 02-10-2014, 09:04 PM
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Truck sputtering/bogging under load, I am stumped

Hi everyone, this is going to be a long post so please bear with me.

I have a 93 F150 XLT 5.0L/E4OD 2wd.

I recently swapped the exhaust manifolds for BBK Shorty headers, removed/cleaned the upper air intake, rebuilt all the injectors, new cap, rotor, spark plug wires and replaced some of the old vacuum lines with new ones.

When I first got the truck back together it was running horribly and had a terrible exhaust leak. Turns out the EGR tube to the intake manifold had a crack in it so I fixed that and hoped for the best. The exhaust leak is gone but the truck doesn't want to run right when I am driving it.

It starts and idles fine but as soon as it is in gear and I start moving it bucks/sputters/bogs really bad almost as if I am down a cylinder. Prior to my "upgrades" the truck was running fine other than the exhaust gasket on the one side being blown.

When I was taking it apart there was a ground strap from the passenger side firewall to the passengers side of the engine block. I broke this strap when I was removing it and haven't replaced it yet, could this be causing my issues?

If I messed up one of the fuel injector o-rings during re-assembly would it cause a vacuum or fuel leak? There is NO raw fuel smell with the truck running and everything appears dry.

I have double checked my spark plug wire routing and it is correct so crossfire isn't the problem.

I am at my wits end and the wife isn't too pleased with the amount of time I have spent working on the truck this weekend, so any help/suggestions you guys can provide will be a HUGE help.

Thanks,

Grant
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Old 02-11-2014, 07:29 AM
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Quote:
Originally Posted by bcboy4ca View Post
When I was taking it apart there was a ground strap from the passenger side firewall to the passengers side of the engine block. I broke this strap when I was removing it and haven't replaced it yet, could this be causing my issues?
It certainly isn't helping them. Depending on the quality/integrity of the main ground at the engine block, that ground may be necessary.


Quote:
Originally Posted by bcboy4ca View Post
If I messed up one of the fuel injector o-rings during re-assembly would it cause a vacuum or fuel leak? There is NO raw fuel smell with the truck running and everything appears dry.
It will result in a fuel leak if it is one of the upper o-rings. A lower o-ring will result in a vacuum leak.


I'd advise doing a smoke test for vacuum leaks first. Then we can proceed from there.
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Old 02-11-2014, 07:30 AM
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Yes you need that ground strap.
If that doesn't fix it, check your fuel pressure at the rail, and see if you have any fault codes in the computer.
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Old 02-11-2014, 10:05 AM
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ok so last night I unhooked the battery to clear any codes that may have been stored and re-connected the ground strap. The strap originally connected to one of the exhaust manifold bolts but it wouldn't reach so I attached it to the side of the upper intake manifold, will this work as a ground point?

I drove the truck to work today and it is running really bad, I am going to see if I can get it scanned for codes and go from there. I will let you guys know what codes are found.
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Old 02-11-2014, 11:40 AM
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Sounds like you have the plug wires routed incorrectly. Are you new to Fords perhaps? See the diagram below and double check against what you have done..
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Old 02-11-2014, 02:03 PM
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Well sometimes it is the simplest of things, I feel like an idiot now

The number 8 cylinder spark plug had a crack in it, new set of plugs and it runs like a top again.
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