Hi
I have been reading for the last year, but this is my first post. I have 1999 34 f motor-home with 2 valve V10 .Before storing her for the winter i changed the oil and fuel filter,put st-bill in the tank and she was running sweet.I took out the batteries so i could keep them charged. Sprig time-time to wake up. She starts first shot.idling smooth. Lets go for the ride- gooing good until trying to accelerate in the top gear, SHE WONT GO, as soon as i press the throttle she starts jerkig so hard that even the steering wheel rattles ,but if i force the shift to 3th gear she smootly accelerates .I tried re setting PCM ,no change,cleaned mass flow sensor,no change.She will run smooth in overdrive until i try to accelerate. Can you help. I know you guys have lot of good advice.

Thanks
Dave

 

Welcome to FTE, tatapepek

Does it feel like a misfire or is it just losing power?

Sounds to me like a fuel problem - maybe fuel pump or injectors clogged. Also - the fuel filter may have gummed up.

 

When you stored the MH was the tank full of fuel? possible water in fuel ,stabil will do nothing to prevent that.A partially full tank will cause moisture.

You could have a fuel pump problem,a fuel filter problem or a regulator .

Could also be a vacum leak at the pcv hose elbow

Then again it could be a COP going bad or water or moisture in the sparkplug hole.

Rich

Mr big hows the coffee this am?

 

It hits the spot, Rich...Thankee kindly. And how's your old bones?

 

WELCOME to FTE!

Check all sorts of things - vacuum lines, that pesky PCV plumbing elbow, etc. Rich is right, it might be water in the fuel.

Being parked and not used leads me to one thing: Critters chewing on stuff. So, check all the vacuum hoses.

Check fuel pressure, especially when it decides to act up.

And report back!

 

Hi Guys

Tank was full of fuel,checked the vacum lines,pvc elbow,no sign of critters,new fuel filter.

Thanks
Dave

 

Sounds like the torque converter lockup clutch is slipping.

Got enough ATF fluid in 'er?

 

If you've checked the fuel pressure - then you must have gotten some moisture in the plug cavities, maybe even got a little corrosion on the contact of one or more coils.

 

But why would it do it only in overdrive?

Stranger things have happened though

 

Have you chk the air intake tube before the air filter for a mice nest ?
Dirty maf,
Still thinking Cop problem or fuel pressure

Does the overdrive cancel work? (on the shift lever)
rich

 

Because that's when it's begging for more power....maybe.

Paris staying in jail? Bigfoot wedding? Global Warming?

 

Hi

Overdrive cancael works,and i cleaned mass sensor , no nests in the intake tube or filter.She idles smooth.will have to check cop's.

Thanks
Dave

 

Check your plugs also. Search for the tech info on it first if you're not familiar with the touchy torque specs. I just changed mine and four of the 8 on my 5.4 didn't need a wrench to remove, loose. There was no dielectric grease on the boots either. They were the Bosch Platinums which were gapped about .060 at that point, so I know someone else had been in there. They were all evenly dusty reddish? I've just bought the truck and it's got 125K on it. It now idles better and runs smooth but still chuggs when you attempt to accelerate, basically in any gear. OD cancel works and it smooths out in a lower gear. MAF cleaned. Elbow on the PCV checked. New PCV. No obvious whistles while running either. K&N filter. Trans fluid OK. I'm working around an exhaust leak on the passenger rear manifold port which I've minimized, but not eliminated, but am not sure what effect that might have on the overall performance. Seems like it would obviously be noisey but not necessarily cause the chugging. I'll move up the timing on the shortie headers to eliminate that as well.

My next step will be to replace the fuel filter to eliminate that and also check the fuel pressure while I'm at it. From there, I'll rotate a new COP around the plugs until I find a bad one. Any better suggestions on the COP?

Any other suggestions? Not to hijack this, just seems like what I'm experiencing as well.

 

Changed the fuel filter, didn't fix the stutter. After doing a swap of the coil pack on 6 of the 8 cyclinders, I swapped out #2 Coil and the stutter when attempting to accelerate was eliminated. Pay attention to the dielectric grease you use. I had some left over from something else and used that up first before switching over to new CRC in a dispenser can. The old stuff melted down and ran, which I can't imagine was good. The CRC stayed in grease form. I'll be taking the others apart and reapplying the CRC grease.

Problem solved.

Next, on to the broken studs and the shortie headers.

 

Tatapepek, there's also another forum I belong to which serves the RV community. RV.Net and the Openroads forum. Try there as well. Good luck!