smackaduck wrote:True duels suck and suck gas as well.
KCDuckMaster wrote:Im pretty sure your exhaust is not the problem. This sounds like spark timing. If you have a distributor with a solid state ignition then I would be checking to see if it has skipped a tooth on the gear. If you have DIS ignition then I would be checking the crank and cam positioning sensors. If you have access to a Fluke 98 or a Modis then I would use that to graph the signal from the sensors and you should see a digital signal(fully on or fully off nothing in between). If it looks a little funky then it may be the reluctor ring might have a gap plugged or it might be broken or the sensor could have some crap collecting on the end of it which will cause it to give an inaccurate reading. Since those sensors are magnetic, they can pick up alot of crap.
Thats my guess!
KCDuckMaster wrote:A vacuum leak wouldn't cause a misfiring and back firing. It would only cause a high idle, poor fuel mileage, and your check engine light would come on for lean 02 sensors.
About your a/c there will never be a check valve in an A/C system because there is no need for one. Maybe sea duck is talking about the orifice tube or expansion valve (only one of the other, not both and most likely the orifice tube). When the problem occurs do you have it set to blow out the vents or the floor? Because the diverter door is probably operated off engine vacuum and the default position is to blow out the defrost so when vacuum is lost the door automatically closes and the air is blown out the defrost so maybe check your defrost vents the next time it happens.This happens when you get into the gas engine vacuum falls and when your cruising with the trailer your engine load is higher and when ever engine load increases manifold vacuum decreases. So my guess on that would be you have a diverter door vacuum solenoid that is leaking. If I were you and if that is the problem I would live with it because I can guarantee you that will not be fun, if you must have it fixed I would highly, highly recommend that you take it to a shop.
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