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Van misfiring... Need help

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Van misfiring... Need help

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  #1  
Old 08-15-2018, 10:24 AM
Bent Redger
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Default Van misfiring... Need help

I recently bought a 1993 Dodge Ram 250 Van (318)
with about 200,000 km's on it. Everything works really well in it but once I get it over 90km/hr it has a slight engine stutter. Like it's mis-firing. Accelerates fine & decelerates fine but when I level off and cruise at 100km/hr or so I get a stutter in the engine. I've replaced the plugs and wires thinking that was the problem, but it wasn't. The van had sat for a couple years so I filled it with premium fuel & put some fuel conditioner & injector cleaner in it also. Any other advise on what else I can look at to fix the problem? I've put about 500kms on it since I bought it and seems to be ok. More annoying than anything... Would just like to get it running properly.
 
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Old 08-15-2018, 12:00 PM
alloro
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The fuel pump could be failing and is not able to deliver the higher rate of fuel needed at the higher speed. Does it also lose power going up hills?
 
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Old 08-15-2018, 12:14 PM
Bent Redger
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Originally Posted by alloro View Post
The fuel pump could be failing and is not able to deliver the higher rate of fuel needed at the higher speed. Does it also lose power going up hills?
If anything, the stutter happens when I slightly let off the throttle when going down hills. If I'm putting the pedal to the floor and accelerating, it seems to run better/doesn't miss.
 
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Old 08-15-2018, 08:37 PM
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Either a vacuum leak, (intake plenum gasket?) or maybe a marginal crank sensor.
 
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Old 08-16-2018, 11:49 AM
alloro
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Originally Posted by Bent Redger View Post
If anything, the stutter happens when I slightly let off the throttle when going down hills. If I'm putting the pedal to the floor and accelerating, it seems to run better/doesn't miss.
That symptom is a sign of dirty injectors. Taking your foot off the gas closes them down to the point where fuel doesn't flow.
 
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