Engine Dies As Soon As Boost Is +

[jetjock]

While I'm with Aaron on the possible cause (a few months ago I repaired a car that had the same symptoms with the same cause) if I were you I'd test it first. A quick way of doing that is to jump the FP terminal in the diagnostic block and drive the car. If the problem remains it's not the relay. That said see isnms's post in the General Section on delayed cranking for the standard Bosch relay pinout. See the online EWD for wiring. Bosch will do the job but since so many people jump them you could probably get a factory relay cheap in the WTB section. I MacGyvered the one I fixed with a spring from a ball point pen. Not something I'd do on my own car but last I heard it was still working fine. I'd test it first though. From what I've read your car is heavily modded and it could be lots of other things.

 

[mattjk]

Doesn't sound like boost leak, sounds more like you're in limp home mode.

Learn how to check codes and post back here.

I had this exact problem in my MR2 turbo. As soon as I got into boost, the car would stall. It was a busted knock sensor.

 

[mattjk]

hey all..sending this from my phone hope it goes thru....it turned out to be a leask in the HKS tee...as well as a shitty knock sensor....

lol just saw this post. knock sensor was bad?

 

[kapkaniMD]

While I'm with Aaron on the possible cause (a few months ago I repaired a car that the same symptoms with the same cause) if I were you I'd test it first. A quick way of doing that is to jump the FP terminal in the diagnostic block and drive the car. If the problem remains it's not the relay. That said see isnms's post in the General Section on delayed cranking for the standard Bosch relay pinout. See the online EWD for wiring. Bosch will do the job but since so many people jump them you could probably get a a factory relay cheap in the WTB section. I MacGyvered the one I fixed with a spring from a ball point pen. Not something I'd do on my own car but last I heard it was still working fine. I'd test it first though. From what I've read your car is heavily modded and it could be lots of other things.

Will do, just if you could tell me which terminals I am jumping. Also if it works, and said that most people do it. Is it ok to just run the car with the terminals jumped????? Also since people are saying they had a knock sensor problem, is there a way to test that as well? THanks for all the replies

 

[bigaaron]

Even if you find a used relay it's still 16+ years old, that's why if it is in question I just replace it with a Bosch, because the operation of that relay is critical. They get moisture inside (usually from pressure washing) and can become intermittent.

 

[starscream5000]

Don't run the car with the terminals jumped all the time. Take you time and get the part if it is indeed your problem. If Toyota wanted the terminal to be jumpered all the time, it would have been...

 

[jetjock]

Aaron has a point. It's the same as with a used TPS. Used is questionable. That said mine is 20 years old ago and zero problems but everything on my engine is corrosion free. It's a crap shoot depending where the car was driven, how it was maintained, on and on. I'd go new OEM if it tests out bad but I'm anal about keeping my cars as close to original as possible other than power upgrades.

SS: I agree he should do it only for testing but how is leaving the jumper in any different from the 12 volt mod? Imo both are dumb on a stock engine but they're electrically the same thing.

 

[starscream5000]

Is that what the 12 volt mod is? I've never looked it up as I don't have an aftermarket fuel pump :dunno:

 

[jetjock]

Both place 12 volts on the pump full time. I still say he should test it by jumping the block. The way I check pumps is to put a current meter in place of the jumper. You can tell a lot about the health of a pump and it's circuit by doing that. Monitoring fuel pressure during a snap throttle test will also show fuel system problems although not necessarily this one. If it's really the relay boosting with the block jumped will confirm it because the symptom will disappear.

 

[bigaaron]

I totally agree, the proper way to diagnose it is to jumper the fp to b+ in diagnostic connector. I was putting the cart before the horse by giving a fix without explaining how to figure out if it needs fixin' first.

 

[kapkaniMD]

Even if you find a used relay it's still 16+ years old, that's why if it is in question I just replace it with a Bosch, because the operation of that relay is critical. They get moisture inside (usually from pressure washing) and can become intermittent.

could you give me the connection match up for the bosch 30A, also where do you get a bosch relay at, I picked up a similar one at radio shack is that basically the same

 

[jetjock]

Jeez, I find it amazing you're in med school. Assuming you finish I hope you tell us where you're going to practice so I can stay as far away from there as possible. If Aaron wants to babysit your gluteus maximus fine but unless you stick a freaking jumper in the diag block between FP and B+ then go boost the car and see if the problem goes away you won't get another peep out of me.

 

[kapkaniMD]

Jeez, I find it amazing you're in med school. Assuming you finish I hope you tell us where you're going to practice so I can stay as far away from there as possible. If Aaron wants to babysit your gluteus maximus fine but unless you stick a freaking jumper in the diag block between FP and B+ then go boost the car and see if the problem goes away you won't get another peep out of me.

you seem to be the resident asshole on this forum, seriously, how many people have to tell you that, unless you have some input on somebody's problem then just shut up. I dont work on the car everyday, i seem to have more important things to do than that. SO I like to have everything ready for when I do work on it instead of just waiting around on the internet for people to respond. Seriously, you answered the question, which i appreciate, now find something else better to do with your time then sit on a website and harass people

p.s. we cant all be supra electrical experts that sit on the internet and post on websites, I'll be sure to let you know where I am practicing so you can drive by and wave

 

[mattjk]

yeah, this is a great place to come for help. Welcome!

 

[jetjock]

Uh, and I'm supposed to feel what exactly? Sure, I'm the resident asshole. Kind of like it that way too. The management and others here are free to vote me off the island any time they like. Even the punk fat Asian kid gets a vote.

I was trying to save you both work and cash (since you've whined about how little of both you have) but what really irks me is when people I try and help don't listen. You think I don't have better things to do? I'm here because I work very little making more than you'll see slaving 100 hours/week in some residency. You're right though, in that I shouldn't be wasting time on morons and frankly you come across as one in every thread you've made. Diagnostic, listening, and critical thinking skills all suck. Based on that you'll make a great MD. Ah well. I tried, as did others. It'll be my pleasure watching you flounder from here on.

 

[Aspec]

:biglaugh:

I hope you won't be too upset if I'm the first to use your quote in my sig cuz I still luv ya.:love:





:rofl:

 

[mattjk]

Yay! When is the voting? I'm ready!

 

[Mr.PFloyd]

wow this thread got ugly fast.... way to go all of you...

 

[mattjk]

wow this thread got ugly fast.... way to go all of you...

shut up, hippy! let the old guy pick on the md student. LOL

 

[jetjock]

Ugly? Lol. Like many you don't get it: it's the internet. Means squat, zip, zero, nada