UCANTRY

My 94 is basicly stock except for a cat back and filters.

Now my boost problem comes and goes.Kinda works when it wants to.

At start up driving for about 4 mins the boost dont like to build.

After about 4 mins the car runs like a champ.

After about 10 mins the boost in the primary will build then sometimes fall back to 1psi and if I stay in it like that it will stay at 1 pound and this goes for the secondary. sometimes in second at around 7000rpm it will go back up.

But like I said sometimes it works sometimes it dont. I changed the turbo control solonoid hoping that was the cause but it wasnt.. I am at a lost any advise would help.

evo2fd baby

your boosting you car after its only been running for 4 mins?

FallenCho

iTrader: (1)

Who doesn't boost there car after 4 mins? After you start the car up it's usually warmed up by the end of the first block you drive it down. :p

Marek

iTrader: (2)

Check the coupler to the Y pipe if you haven't already.

SchoolZone

Really?

maxcooper

The DTCS on the car is specifically designed to keep you from boosting at high RPM on a cold engine, IIRC. I suspect this is at least part of the reason why the turbo response is less than expected in the first few minutes of running. Don't boost on a cold engine.

The drop to 1 psi after warm-up is probably a separate issue, and it does sound like something is wrong. There are a bunch of threads about diagnosing turbo problems on here, but I don't have links for you.

-Max

TRWeiss1

iTrader: (20)

Yeah, it could be a multitude of things that cause a boost leak. How many miles on the motor/turbo's? Have you checked the wastegate(s) to make sure they're opening and closing properly? Just thinking about it, if a wastegate is stuck partially open, some exhaust gases would spool the turbo while others would divert through the wastegate.

yuichiror

iTrader: (1)

Here's a great troubleshooting page for the twins:
http://www.autosportracetech.com/RX-...leshooting.htm

Yeah, Max is right. The double throttle system will prevent you from boosting on a cold engine. So don't try until the engine is at operating temp.

UCANTRY

I believe its the turbo control solenoid. i replaced the rats nest solenoid but not the other one.Didnt know it had two parts to it.So i will try tomorrow.

moconnor

iTrader: (14)

It takes approximately 3 miles and 10 minutes for my car to hit 82C from cold in urban driving.

Unless the block you drive down is somewhere in hell, I don't think so.