Boost/vacuum issue...

[1QuikSRT]

So I had the truck out last night and today and it was running fine, pulled the same, sounds the same, around 19-20hg on the vacuum at idle.

Just a lil' while ago we were driving home and I noticed the boost guage was a lot more sensitive than it usually is. I let off the gas and went to neutral and the vaccum dropped to 9-10hg. Plus it will jump positive with just a slight blip of the throttle, which it has never done before. I would be cruising in the passing lane and the guage says I am +1-2psi.

So first I am scared that I blew a gasket with the low vacuum. The truck saw maybe 3psi tonight when we got on the highway. However I think it might be a guage line issue and I'm not sure where the vacuum line would be located on the engine.

No smoke, idles at 750, smooth acceleration...weird guage readings. Any thoughts?

 

[505'sFastestViper.]

First try another gauge
To eliminate a faulty gauge then report back to us


Dom
Undefeated on the Internet

 

[VENOMOUS1 RACING]

The gauge will be tapped from your intake manifold likely or off your brake booster line or another vacuum line sir. If its running normal thank likely a gauge or line issue. Could be dirt/contaminate for to gauge. May try removing and blowing out nipple on gauge.

 

[1QuikSRT]

Where at on the manifold? Towards the back, towards the front...so sad, when I had my RX7 I could find any cable/tube so easily. I had so much more experience.

And of course, thank you guys for responding...at first I thought the thread might get passed by:dontknow:

 

[Slitherbeast]

Check the sensing line for melting. Mine is plastic

 

[505'sFastestViper.]

Not here bro we try and help are people out


Dom
Undefeated on the Internet

 

[1QuikSRT]

Went under the hood, there are quite a few black rubber lines under there...WOW! I Traced the majority of the vacuum lines, snugged them up to the T-connectors or whatever they intersected with...

Started the truck and vacuum was 18-20hg again, gave it a bit of gas and it stayed in vacuum and dropped to 22-23hg for a sec then back to idle. Looks like crisis averted for now Getting ready to go on vacation, don't have an extra $1k sitting around for a new gasket.

 

[VENOMOUS1 RACING]

Great to hear bro!

 

[505'sFastestViper.]

Great to hear bro


Dom
Undefeated on the Internet