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Old 09-15-2013, 04:02 PM   #1
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Angry 8.1 Chevy Pops and looses power on grades

Hope someone can help me on this very challenging problem. Love our Winnebago and everything has been great until about two years ago on a trip. The engine runs great on flat ground and gets anywhere between 8-10 miles per gallon.
Now the engine pops loudly and looses power on a climb. As soon as I start a hill and the motor has a load on it it starts.
I have done just about everything I can can think of: plugs, plug wires, fuel filer, compression, emptied tank and put in 92 non ethenol in it, lots of additives, cps.
I've had two reputable mechanics ride me and put their portable scanners on the engine. No fault codes of any kind.
Has anyone else had this problem and fixed it?
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Old 09-15-2013, 05:06 PM   #2
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Sorry your having problems.
Plugs, wires and filters have been the cure for most, 8.1L, performance issues that I'm aware of , but the Workhorse crew should be along with more help shortly.
Questions;
Is the pop a single item when you go full throttle or continual while you've got your foot in it ?
Has the Mass Air Flow sensor been examined ?
EGR valve , checked ?
Is the intake manifold vacuum at a normal level ?
JMHO: Only thing I can think of would be weak valve springs; sticky intake valve.
How many miles on the engine ?
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Old 09-15-2013, 05:22 PM   #3
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Coil(s)? Maybe!
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Old 09-15-2013, 05:33 PM   #4
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Welcome and glad to meet you!

You might get more answers by posting in the appropriate forum. Many of the people that can answer this do not come to the Introduce Yourself forum.
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Old 09-15-2013, 07:15 PM   #5
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I hope your problem gets remedied soon.
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Old 09-15-2013, 07:54 PM   #6
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Hook up a fuel pressure gauge and monitor it while it happens. Does it occur if you go wide open throttle up to highway speeds. If you loose fuel pressure, it is possible to have induction backfires.
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Old 09-15-2013, 08:03 PM   #7
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Don't know about the pops, other than a possible exhaust manifold leak.

However a loss of power can be caused by a dirty MAF sensor along with a dirty air filter. After cleaning my MAF my lower power and surging problems went away along with the O2 sensor warnings.

What year and how many miles are on your rig?
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Old 09-15-2013, 08:04 PM   #8
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Quote:
Originally Posted by kruzer55 View Post
Hope someone can help me on this very challenging problem. Love our Winnebago and everything has been great until about two years ago on a trip. The engine runs great on flat ground and gets anywhere between 8-10 miles per gallon.
Now the engine pops loudly and looses power on a climb. As soon as I start a hill and the motor has a load on it it starts.
I have done just about everything I can can think of: plugs, plug wires, fuel filer, compression, emptied tank and put in 92 non ethenol in it, lots of additives, cps.
I've had two reputable mechanics ride me and put their portable scanners on the engine. No fault codes of any kind.
Has anyone else had this problem and fixed it?
Intake leak is my guess. Related to throttle position and manifold pressure...Will it do it on a flat surface when you go to WOT?
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Old 09-16-2013, 08:08 AM   #9
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Hi and Welcome to IRV2! We're sure glad you joined us!

Sorry I can't help with your problem.

Good luck, happy trails, and God bless!
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Old 09-16-2013, 03:35 PM   #10
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8.1 Chevy pops and looses power on grades answers

Thank you for trying to help me on this very challenging problem.
1. For Skip 426.....yes it is a continual popping noise coming (I think) out of the intake manifold. Also, as I drive along I feel a little buffeting. Yes I've checked the Mass Air Flow. EGR is good. As far as intake manifold vacuum I don't know on that one, but my fuel pressure was at 52 lbs. and holding.

2. For JMHO.....42,000 on the engine. Pulled valve springs on lowest compression cylinder all above 160-165. Valve springs to speck. Not broken on #2 cylinder. Don't know if I have a sticky intake valve. Good compression on all cylinders.

3. For DMorgan 6375......Coils: Haven't done that step yet. Don't know how to test. No error codes. Very expensive to replace all of them. Any suggestions?

4. For James rxx951......We did the fuel pressure monitor. Yep! Pops like crazy at full throttle. Fuel pressure stayed above 52 lbs.

5. For Arch Hoagland.....42,000 miles. 2001 Winnebago Adventurer. Only affected when warm outside and going up a steep grade. MAF checked. I will check my air filter.

6. For Calhyatt.....It will when it is hot.

I really appreciate all of you trying to help me on this. We are in Grass Valley and on vacation. Concerned about heading home and going up 3 summits with Ashland being the highest on I-5.

Is 52 lbs. plus adequate? I'm at my end. Can't figure this out. I was assured my crank shaft positioning sensor (which I replaced) would solve it. To no avail.
The thing that really puzzles me is I ran for 200 miles, up two summits going south to California with absolutely perfect running. As soon as I started up the Shasta summit with the outside temperature up it started popping and progressively got worst. Needless to say I am stumped....
Lonnie Tharp














Quote:
Originally Posted by kruzer55 View Post
Hope someone can help me on this very challenging problem. Love our Winnebago and everything has been great until about two years ago on a trip. The engine runs great on flat ground and gets anywhere between 8-10 miles per gallon.
Now the engine pops loudly and looses power on a climb. As soon as I start a hill and the motor has a load on it it starts.
I have done just about everything I can can think of: plugs, plug wires, fuel filer, compression, emptied tank and put in 92 non ethenol in it, lots of additives, cps.
I've had two reputable mechanics ride me and put their portable scanners on the engine. No fault codes of any kind.
Has anyone else had this problem and fixed it?
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Old 09-16-2013, 05:51 PM   #11
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Map sensor maybe?
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Old 09-16-2013, 05:52 PM   #12
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Is the "Check Engine"light on?
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Old 09-16-2013, 06:26 PM   #13
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MAP sensor has been checked. Thank you.




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Map sensor maybe?
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Old 09-16-2013, 06:27 PM   #14
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No. the check Engine Light has never come on. Nothing makes much sense. Thank you.



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Is the "Check Engine"light on?
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