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Old 09-16-2015, 10:29 PM   #1
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Bad missing pulling hills help!

Someone has had this problem with there 1998 airstream 30 LY motor home 7.5 liter please share your experience and if possible your solution. We are on the road and have changed distributor cap and rotor thinking we had a moisture issue. Put in three cans of heat in the gas thinking water in the gas. The plugs and wires and gas filter have maybe one year and 6000 miles on them but we bought a new gas filter tonight to put on tomorrow maybe.
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Old 09-17-2015, 07:01 AM   #2
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A good place to suspect a problem with your concern is the pick-up coil inside the distributor housing. If it is the problem I would also replace the ignition control module. Don't cheap out and buy the non OEM parts from the big box stores and order Factory AC DELCO from Rock Auto.
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Old 09-17-2015, 12:15 PM   #3
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Spark plugs? Might have a bad one.
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Old 09-17-2015, 07:58 PM   #4
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Is it missing or could it be fuel starvation. Does you rig have the rear elec. fuel pump in addition to the mechanical motor pump?
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Old 09-17-2015, 08:10 PM   #5
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x2 on the ignition coil, ours was bad when we bought the coach and got worse. Once the motor was warmed up it would miss under load.
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Old 09-17-2015, 08:36 PM   #6
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I would change the plug wires and spark plugs for sure. When the engine is under a load, there is an increase of cylinder pressure that increases with engine speed. This faster and more effective cylinder filling creates a need for a hot powerful spark, especially as the ignition timing advances and the manifold vacuum decreases.

You can idle all day and mutter at low speeds and it runs fine. The coil may be a problem, but they usually are a go-no go component.
A good way to check your plug wires is a night with the hood up in a very dark area. Watch for arcing along each wire.
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Old 09-17-2015, 10:06 PM   #7
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Are you at high RPM when pulling the hills? I suspect you are.

Check the coil/coils for burn marks.

Something I do is get a spray bottle and find a dark spot. At idle mist around the cap, coil(s), and wires and look for small sparkles. (don't touch wet stuff with engine running high voltage is dangerous)

If you have a timing light check the timing. If its old school distributor with vacuum advance check for vac leak to distributor.

In fact check for vacuum leaks period. High rpm hill climbs draw more vacuum.

Older distributors have little governors in them that effect timing too, but that usually causes a sluggish throttle response.

What is the fuel delivery in this motor? Direct injection, the single port carb injection thingy or carberated?

I doubt it is a fuel problem, just from my own experiences. Spark, or vacuum leak
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Old 09-18-2015, 08:41 AM   #8
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I changed that gas filter the next day and there was water in it, I could see it in the bottom of the bowl that I drained it in. I went to a Napa store to buy several cans of Heat he recommended instead 7100 Thermo-aid to remove water from tank. I don't know if there is any difference between Heat and 7100 but I think it ran better at the end of the day then at the beginning.

I did run the engine at night no visible sparks anywhere. The coil at jest the right angle emitted a little light no arks no trace marks. Considering the amps it is dealing with I would think there would be some sort of a surface charge am I wrong?
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Old 09-18-2015, 09:19 AM   #9
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an ignition leak can often be detected by listening for static on the radio. tune it to AM and pick a spot on the band that has no broadcasting at that point. listen for static that matches engine rpm.
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Old 09-18-2015, 09:37 AM   #10
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That's interesting....How much water?

Water in fuel usually effects all rpm's.

If you were in total darkness and saw a light then you are leaking voltage. From my experience the voltage leaks tend to glow more than arc. I would not expect a surface charge because electricity follows path of least resistance.
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Old 09-18-2015, 12:16 PM   #11
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I would change spark plugs. Under pressure the spark can 'blow-out' when the plug is worn and has no sharp edges. An older motor may not have newer platinum plugs that do not erode as quickly
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Old 09-18-2015, 07:10 PM   #12
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Quote:
Originally Posted by richinny View Post
an ignition leak can often be detected by listening for static on the radio. tune it to AM and pick a spot on the band that has no broadcasting at that point. listen for static that matches engine rpm.
I have used an old pocket radio on the AM for the same thing
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Old 09-18-2015, 07:59 PM   #13
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Timing, check your timing.
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Old 09-21-2015, 08:34 AM   #14
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I'd go with spark plugs. I replaced plugs on one of our cars, got Bosch platinum. It started developing a bad miss under load and in wet conditions. Turns out 3 out of the 8 plugs cracked with under 10k miles on them. Replaced with Ac Delco as my mechanic recommended and it solved the issue. Mechanic said Bosch and NGK are not what they used to be.
If that doesn't help, I'd try the coil. Had similar issues on a different vehicle. Replaced the coil, solved the problem and it started easier. Coils will start to break down over an extended time.
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