Two questions.....

[BennyLumpkin]

So two questions on my 99 Ram ...first is when on max cold it randomly switches itself from blowing out the vents to out the defrosters. Sometimes it switches back and other times I have to turn it off a bit then back on to get it back on right.....makes no sense to me.....secondly when lugging the engine it has a bit of a surge or gallop....only thing I havent replaced is the cap and rotor....plugs are new. Could that be the issue or is there something else going on?

 

[txbass06]

For your A/C issue, that sounds a lot like your blend door actuator. It's the vacuum controlled door that changes air flow between the different vent settings

 

[Bigtman07]

Most likely a check valve under the hood. Cheap fix. The lugging could be the cap and rotor or possibly something else. But would look into that a little deeper

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[Mopar1973Man]

I say vacuum leak...

The vacuum leak is allowing the HVAC to default back to DEF more under heavy loads and then returns back normal vent position when you let off the throttle.

As for the surge that is also from the vacuum leak because now the computer is trying to compensate for the vacuum leak (lean condition) and the fuel mixture is being fouled most likely on the passenger side when the vacuum line hooks up.

I say fix the vacuum leak and the rest will go away. I went to the hardware store picked up about 10 feet of vinyl tubing replace all the plastic crap lines under the hood... No more of that problem for my 96...

 

[Bigtman07]

Good call man. Never thought to do that.

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[Mopar1973Man]

Good call man. Never thought to do that.

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Stepped on those toes again...

 

[Bigtman07]

Lmao nope just givin me more idea. Lol

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[RobS]

simply j/y fix, its the vaccum tube on the passenger side of the manifold...been there, done that, pop it off a junker base model (if you can find one...reffering to a truck without cruise control, there plugged off) most likely you'll find its the same as yours with plugs for a/c, blow threw it one way, if you can, try sucking the other way, if it locks up on the sucking way, its good...if not go to the auto parts store....

 

[BennyLumpkin]

Well no vacuum leaks to be found but I did find my PCV valve was gummed up and stuck. Got it loose bit need to just replace it. It helped but hasn't fixed all my problems ....the ac ducts still change themselves and I need to reset the check engine light.

 

[BennyLumpkin]

Talked to a guy I know that swears dirt lays in the top of the injectors because they have no filter or return system. Pulled them last night and cleaned each one and replaced thr very bad cap and rotor. Ill know tonight how it runs. I cut one injector O ring so I had to get some today.

 

[BennyLumpkin]

Test drove it last night....still gutless.

 

[Bigtman07]

hmmmmmm that is interesting. only other thing I can think to suggest is a compression test. May have a bad ring or something. Hey Moparman What about the TPS??