Intake gaskets and SC VX

[SGT.BATGUANO]

Did this just happen out of the blue or has ANY work been done lately?

Also check intake ducting connections, air temp sensor fitting, valve cover vent connection, fuel pressure and regulator.

[MachineVX]

There hasn't been any work done before this happened, and it's something that's been gradually getting worse. I have a vacuum boost gauge that was working intermitantly for the last month and is now stuck on the highest reading (24). I thought the sending unit or the gauge was bad, since it's an unreliable Cyberdyne unit. Now, I think differently.

[Jolly Roger VX'er]

When i did mine I didn't think of the throttle body gasket...I bought one recently for about $4.00 just to have on hand in case I start pulling in unmetered air and want to change it out as it is only 4 bolts and disconnecting the throttle/cruise cable as well as unplugging the sensors.

Not having your idling problems but I recently had a check engine light indicating "lean under acceleration" and "bank 2 O2 sensor #2". I replaced the fuel filter first as it had 15k miles on it..didn't help.

Than I pulled my cone filter & cold air intake and reinstalled the factory airbox to choke off some air....didn't help.

Finally, I tried adjusting the fuel regulator by turning the security torx screw about 1/4 turn clockwise to go from lean to rich (as Tone mentioned) and it seemed to do the trick...about a week and no check engine light and I notice a bit better performance.

I bought a new fuel regulator in case I need to swap it out and in the process found out that you can buy a fuel regulator rebuild kit from dealer for about $12.....or buy the entire unit for about $52....as it turned out I have both! I figure I can swap out the original with the entire unit and rebuild the original for later use.

Also check the allan bolt that mounts the EGR bracket to the rear of the SC as if this comes loose you will get a vaccuum leak...mine could be snugged up a hair.

[MachineVX]

It was the gaskets. Greg and the tech at www.driversimage.com did a great job. I highly recommend them for your VX needs. No more check engine lights or codes. The VX is back to its robust self.

[Green Dragon]

It was the gaskets. Greg and the tech at www.driversimage.com did a great job. I highly recommend them for your VX needs. No more check engine lights or codes. The VX is back to its robust self.

It appeared from your previous post that the intake manifold gaskets were not the problem. Could it be that the manifold bolts were retorqued to the required 18 Ft lbs or more the second time around?

I ask because I am about ready to reinstall my rebuilt SC & new intake gaskets. When I removed the intake bolts & nuts the torque value appeared to be a lot higher than 18 ft lbs, more like as tight as you can get it + 1/2 a turn.

Incidently, my Throttle body had no GASKET installed

[MachineVX]

You might be right that it originially was over torqued, so I made sure this time that I gave them all the right torque specs, which I should have done in the first place.

[Green Dragon]

You might be right that it originially was over torqued, so I made sure this time that I gave them all the right torque specs, which I should have done in the first place.

Thank you for your quick reply. Perhaps undertorqued (13 ft lbs) The right torque specs being 18 FT lbs (Isuzu manual) & not 13 Ft lbs is that correct?


Bob F