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Discussion Starter #1
this has been happening for 5 months but progressivly getting worse and worse.. I start the truck and a huge hissing sound from front engine, ( replaced IAC 2 times now still not a fix for that ), also when i start driving i'll get to about 20-25 sometimes 30-35 then the engine doesnt die but hesitates rpms go down to 600 then i hear a POP POP POP until i let off the gas, but then if i hit the gas it starts popping again so i have to pull over shutdown restart and then its good , this issue happens when ever it wants to somedays nothing at all and others all day long , The Popping sound appears to be in front of me not below ( trans area ) or the rear. ANY IDEAS will be greatly appreciated, i have a baby due on the FEB 28th and this is not what i want to be thinking about right now :huh:
 

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Do you have any exhaust leaks? My '98 v6 Dakota was doing pretty much the same thing, if I dropped it into neutral and revved the engine it would clear up and run fine again. Once I got the exhaust fixed up the problem disappeared entirely.

The hiss you describe though sounds like it could be a vacuum leak somewhere, so you may want to spray around with a can of carb cleaner. The idle will lower when you find the problem area if it is leaking vacuum. Does the exhaust smell like it's running rich? Has it been consuming engine oil? Are the ignition components (plugs, wires, cap & rotor) in good condition? Is the check engine light on?
 

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Discussion Starter #3
it doesnt have an exhaust leak, the hissing only happens sometimes not all the time ( odd right? ) it does smell a bit rich at the exhaust exit , oil consumption has been normal, the plugs, rotor, cap, IAC, TPS, and MAF are all new,

I did break the hard plastic line coming off the front of the throttle body that connects to the thing next to the brake booster , its a hard plastic line with i believe 3 maybe 4 bends in it , i broke it in the middle but just put a piece of vacuum line between the breaks.. i'm thinking maybe i should just replace the whole line but it will have to be rubber because i dont know what that line is called so i'll use universal vacuum line.

this is just a thought ( anyone chime in with ideas )

could it be a going torque converter??
 

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I would start by examining that vacuum line a little better. Sounds like it is the one that goes to the evap purge valve. The valve is controlled by the PCM. I don't know exactly how the PCM is programmed to control it, I have had mine apart before and I think it works off of pulse width modulation... but back in the olden days when automakers were using vacuum diaphragm purge valves with carburetors, ported vacuum was used to switch vacuum from the manifold to the charcoal canister on and off. In this configuration the canister only saw vacuum at part throttle cruise.

If it's leaking it could definitely cause a problem.
 

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Your truck would run just fine with a bad purge solenoid. It's only purpose is to suck vapors out of the fuel tank to be burned during combustion in the cylinder instead of venting into the air.

Have you done any mods to the truck. Did you change anything right before it started? The hissing is normal IMO. Mine does it all the time. It's just air going through the IAC port. Changing the IAC isn't going to fix it.
 

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Your truck would run just fine with a bad purge solenoid. It's only purpose is to suck vapors out of the fuel tank to be burned during combustion in the cylinder instead of venting into the air.

Have you done any mods to the truck. Did you change anything right before it started? The hissing is normal IMO. Mine does it all the time. It's just air going through the IAC port. Changing the IAC isn't going to fix it.
 

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Your truck would run just fine with a bad purge solenoid. It's only purpose is to suck vapors out of the fuel tank to be burned during combustion in the cylinder instead of venting into the air.
I never said it was... but if it was stuck open it would cause issues. I'm not sure why I started talking about the purge valve...:huh:
 

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Discussion Starter #8
I took it to a Transmission specialist after i finally caught the issue on video :D!! ive been trying for month to get it but was never able to get my phone out in time, but now with the video i took it to him ( family friend ) hooked it up to that Snap-On Solus computer and found a short in the Governor Pressure Sensor wiring then it went away then it came back , hes saying that it must be just a loose wire or grounding out and in from a worn wire. its been there since 11am today the 22nd of February, ill keep updating this until the issue is resolved.
 
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