possible turbo problem

[WeldingHank]

well, my friend with the same car. is sending me 3 stock FPR for now. i am just gonna try them out and see what happens. will post back with my findings.

 

[perfworks]

i think you may have an ignition problem. You need to first check fuel pressure while driving. Make sure that the pump is supplying the fuel you need at a CONSTANT pressure thruout the rpm band.

but i would think your ignition is the problem.
i have seen many of those probe ecu's take a s*** and act up. You still using the stock vane meter?

 

[WeldingHank]

yes i am using the VAF. and as all other Probe/MX6 owners, hate it. i am gonna start with the fuel system. then if nessecary. go to the ignition. i will just replace the dizzy. heck, they're cheap enough.

 

[perfworks]

they are notorious for going bad. have PRO_M make you a MAF and get a piggyback to control it.

 

[WeldingHank]

i will also try a friends MAF and ECU. see what happens. i had another probe with 200K+ and never had VAF problems.

 

[Kooldino]

I was thinking MAF, MAYBE fuel (a WBO2 would be nice...put it on a dyno to see what happens), and there's a GOOD chance of a boost leak. ALSO, double check your piping around your MAF. What you described happened to me when things weren't perfectly secure around the MAF.

 

[WeldingHank]

okay, i went and checked all my intercooler piping. and it was all good. tightened it down real tight. specially my TB boot, those are notorious for cracking. took it for a spin...and no buck. but i am still not sure i am out of the woods. it HAS done this before where sometimes it will buck. sometimes it won't buck. just kinda seems like it does its own thing.

 

[WeldingHank]

today, no buck. but now my Vac/Boost guage is strange. when i press on the gas, the vaccum falls as it should. but when i maintain speed, the vaccum slowly rises back to 20 in/hg. is this normal? never did it before.

 

[igdrasil]

thats normal....

you may had a leak, causing an overly rich problem.

I was under the same problem as you by the means that I was running too rich because of a new fuel pump. I decided to put a MBC on the 12:1 FMU.

I still may have a boost leak, but now im running fine.

 

[WeldingHank]

boost won't hold. it slowly falls off now. i think when i inspected my TB boot, i may have cracked it somehwere. i also took my car to the track. whenever i tried to launch the car would fall flat on its face. then jerk like hell the whole way down the track.

 

[igdrasil]

JA

You have a leak somewhere and eventually, running rich...thats what I think

At leat I feel the car fast, pulling strong, no boost drop. Im still running a tad rich (10-11:1) for safety purposes on 7psi.