Engine Dieseling

[HotRodPC]

but after 30 years, you don't know what still there and what isn't.. so just better to trace what you have.

You're right. I usually find that some idiot has worked over all the vac lines, and also as you point out, many parts missing, like TVS ( Temperature Vacuum Switch) that will be shown in the diagram. In that case just skip the temp switch.

I know one for example that used the temp switch and is not necessary is Vac Advance to the dizzy. The purpose is to NOT ALLOW vac advance until the motor is warmed up. The reason for that is to reduce NOX, aka Oxides of Nitrogen with a cold motor. Known in CA as the first smog device that was REQUIRED to be RETROFITTED to cars of the 60's in the early to mid 70's when the law came about.So in the 70's, I think it was back to 66 models, you had to take your car in, and they put a TVS in between your Vac line to the dizzy, so your car ran like **** even worse until it warmed up enough to advance the timing.
Also going further back in the 50's cars that did not come with a PCV valve, just a vent to ambient air, the vent had to be blocked off and a PVC valve installed. OMG, and you should have heard people bitch,.... all this smog ****. Cuz they added a PVC valve and a TVS. All that smog junk.

 

[89Suburban]

 

[MrMarty51]

 

[Jims86]

I just kinda skimmed this thread, but when it was idling high,was it smooth, or rough?

The reason I ask is, if it was a rough high idle, its a vacuum leak. Its actiong the same way that a vehicle equipped with Mass Air Flow acts, because it meters the air before the throttle blade, like MAF.
Speed density type of efi engine is the only type that will have a smooth high idle due to a vac leak, because it does not know much air is entering the engine, and lower vac at the MAP sensor tells the ECM to richen things up.

 

[MrMarty51]

I think,the easiest way would be to as I suggested,plug off all of the vac lines,time and tune the engine then hook the vac advance,recheck timing then one hose at a time until all is hooked and any problems solved in the process.dang,where`d He go anyways.

 

[GunMan9]

Found this in my truck a while ago. Are they usually lost?

You must be registered for see images attach

 

[HotRodPC]

Found this in my truck a while ago. Are they usually lost?

You must be registered for see images attach

Yep, I've never seen one in any of my 11 I've bought in the last 5 years.

 

[GunMan9]

I thought it was neat it was still there. So I went today and bought the Wilson little wil antenna for the truck. Still having the same issue as I was before. Check the RF Output on the menu on the cobra 29lx and get FAIL. My antenna passes. What seems to be the problem? Anyone know?

 

[Boone83K10]

my 83 has the book... it doesn't even look like someone thumbed it at all.