How to fix the lean condition CEL codes on a supercharged VX?

[VehiGAZ]

Thanks for the tips Ldub!

I just went down to Autozone to trade in the MAF and, while they had one waiting for me, their comuter system was out and they couldn't process the return, so I have to go back tomorrow (to pick up the second front brake rotor they didn't have on the shelf).

If that doesn't do the trick I'll have my mechanic check all of the hoses again.

Has anyone ever found an adjustable fuel pressure regulator for the VX?

[Ldub]

Thanks for the tips Ldub!

I just went down to Autozone to trade in the MAF and, while they had one waiting for me, their comuter system was out and they couldn't process the return, so I have to go back tomorrow (to pick up the second front brake rotor they didn't have on the shelf).

If that doesn't do the trick I'll have my mechanic check all of the hoses again.

Has anyone ever found an adjustable fuel pressure regulator for the VX?

IIRC, CYRK is the only one that I can think of who was experimenting.

[WormGod]

I know Cyrk ended up having to go with a custom fuel management. I would fire him a PM and see what he did. Sounds similar.

Though it sounds peculiar that a wiggle of the wiring brought about a CEL. That at least sounds easy enough to remedy with some splicing. God knows, the re-wiring during S/C install was a tedious POS.

I get engine studder occasionally in my VX, but it's only when I have it running, turn it off long enough to run into a store or something, and then start it back up. Only happens on restart. I rev it up to about 2k rpms for about 20 secs and it purrs on its own again. I am sure that is fuel related. I still have yet to replace my fuel filter so it may have somehting to do with it (I am hoping).

Good luck.

[VehiGAZ]

Gary, that's not quite what happened - he didn't get a CEL from touching the loose TPS wiring - it stalled when he did. Prior to that, I was getting CELs almost daily, but since he tightened up thew wiring, I am only getting them once a week or so, and it has (so far) only been the lean condition codes.

The replacement MAF goes in next. Then comes the new fuel filter.

[WormGod]

Ah, well, still sounds like some loose wiring in there. It's all color coded so should be easy enough to resolve.

BTW, what octane are you using?

STarting with the MAF is a solid measure. Baby steps towards a solution. God knows, I am in need of a new EGR. Even after taking it out twice and cleaning it up real well, it still ends up looking like it came out of a 50 year old car.

[VehiGAZ]

I generally run 93 octane - only occasionally do I get stuck with 91 - but it's always "high test" since I supercharged...

The new MAF went in last night and it sort of seems to run a little smoother and stronger. I'll see if I pop any CELs in the next couple of weeks before monkeying with the fuel system (other than changing the filter).

[Hotsauce]

Our stock fuel pressure reg is adjustable.

Its just not a factory approved adjustment.

In the top of the FPR is a tamper resistant torx screw that adjusts fuel pressure. Its factory set, and secured with loctite.

Clockwise increases pressure.

John C.