WOT at immediate car start-up????

[a_scobel]

I just got my car back together after replacing my intake manifold gasket. I'll turn the car on...and the throttle will immediately be wide open, as if i'm flooring it. So then I have to race to shut the car off before it goes past red line. I checked the throttle body cable, it' seems fine.

Edit: To give the car gas (to open the throttle plate), is the wheel on the back of the throttle body turned clockwise, or counter-clockwise (as you're facing the engine bay from the front of the car)?? I'm thinking that may be the problem...I seem to remember, to give the car gas from the throttle body, turning it clockwise. Right now it's set up so that you have to turn it counter-clockwise though.

Thanks in advance!

UPDATE: READ MY LAST POST!! NEW SHIT HAS COME TO LIGHT!!!

 

[Damn 2nd Gear]

m 90% sure it opens clockwise

 

[a_scobel]

I opened it up...it's normally closed. So to open it, it turns counter-clockwise (Throttle cable pulls in). My throttle cable does seem kind of twisted. Whenever you press the gas pedal & it opens, the wire's kind of twisted so it goes off track of the half circle.

Edit: Could it be my throttle position sensor? It's all the way clockwise.

This sucks. I've never heard of a car going WOT right when you start it up, for no reason.

 

[93 Talon Boy]

i got a friend w/ the same problem so i need to figure this out to, sooo:
BUMP

 

[leakyfaucet]

The throttle position sensor wouldn't be able to physically open the throttle, so you know it's not that. Take off your intercooler pipe and take a peek. If it's stuck open, give the cable some slack or find a way to unstick it. (It's really not that uncommon of a problem). If it's not stuck open, then your car has a super secret extra hidden throttle body.

 

[a_scobel]

The throttle position sensor wouldn't be able to physically open the throttle, so you know it's not that. Take off your intercooler pipe and take a peek. If it's stuck open, give the cable some slack or find a way to unstick it. (It's really not that uncommon of a problem). If it's not stuck open, then your car has a super secret extra hidden throttle body.

Nnnnnnope. The throttle plate's closed. I had a friend step on the gas pedal while I watched it, it opens all the way & closes all the way when it's supposed to. Course I did this with the engine off.

 

[leakyfaucet]

Nnnnnnope. The throttle plate's closed. I had a friend step on the gas pedal while I watched it, it opens all the way & closes all the way when it's supposed to. Course I did this with the engine off.

If the throttle plate is closed and your engine can still make it to redline, you either have a quarter sized vacuum leak or a godlike idle valve.

 

[a_scobel]

Just talked to my dad. He told me it's possible it could be a vacuum leak, but if it was a big one, it'd just stall out.

Also maybe the TPS plug is on backwards, therefore wiring it backwards (If the plug's can be plugged in both ways..the plug can only be plugged in one way though, right? You can't reverse it?

Or a pinched wire somewhere.

So I have one Wiseman's opinion....come on, there has to be some Wisemen in here who can give me more ideas!

 

[Omega]

Are you sure everything is connected? I would also check the the IAC (idle air control) if that is stuck open it would cause the engine to race like that.. not sure if it would redline though.

Take the TB off and clean it really well, see if that helps.

 

[a_scobel]

Are you sure everything is connected? I would also check the the IAC (idle air control) if that is stuck open it would cause the engine to race like that.. not sure if it would redline though.

Take the TB off and clean it really well, see if that helps.

I did take it off & clean it when I was replacing the IM gasket. Where is the IAC?? You mean the BISS??

 

[Omega]

I assume that an IAC and BISS are similar. I wonder if there is some crap clogging up the idle passages. I would first check all the connections though, or even disconnect one at a time to see if anything changes.

 

[a_scobel]

I just had a friend watch the throttle body while I turned the ignition on...he said it didn't even move. Would that mean it's a vacuum leak??? I let it go, and it idled at about 6½k.

Also, when I cleaned the TB, I followed the directions from www.plymouthlaser.com (put duct tape over those two holes), and cleaning it with brake cleaner, if this helps. Maybe some brake cleaner got where it's not supposed to get...??

 

[a_scobel]

Okay, I just took it apart & messed with it. Now it's idling at about 2k, I went to the throttle body & manually turned it, and even at full throttle, it wouldn't go past about 2300. It'd go up to 2300, then drop down to about 1900, and repeat. It's like once it hits 2300, it just can't go any higher so it drops down to 1900...and so on. The BISS is in all the way, with the throttle position sensor turned clockwise all the way.

Anybody???

 

[a_scobel]

So I disconnected the wiring harness to the TPS and started the car up... lo & behold, the car no longer surges, and when I get on the gas, it doesn't stop me at a certain RPM anymore. BUT...it still idles at about 2300. The BISS is screwed all the way in (I turned it out, but all that did was raise the idle).

Would that mean I need a new TPS??

 

[ItsStockOfficer]

Sounds like big vacuum leak, its etheir the Brake booster in the back or the PCV from the valve cover.

 

[NOSLO2PT0]

did you try adjusting the idle stop screw? it's got a black wire running off it, with a single terminal on top. That can make you idle a LOT higher than normal. Make sure it's all the way out and TPS is showing 0% then screw the idle stop screw in until the plunger gets pushed in. Tighten the locknut down.

 

[a_scobel]

did you try adjusting the idle stop screw? it's got a black wire running off it, with a single terminal on top. That can make you idle a LOT higher than normal. Make sure it's all the way out and TPS is showing 0% then screw the idle stop screw in until the plunger gets pushed in. Tighten the locknut down.

you mean the bolt on the intake manifold for the throttle cable? Yes, that's fine. The throttle body opens & closes at 0 & 100%, so that's good.

Sounds like big vacuum leak, its etheir the Brake booster in the back or the PCV from the valve cover.

Where exactly is the brake booster?? Is it on the very bottom of the intake manifold, on the side...? Is it viewable without taking out the wiring harness or anything, I'd really hate to have to take my IM out just to look under it. Thanks!

 

[a_scobel]

Hm anybody? (Sorry, hate to bump, but tomorrow's pretty much the last day I can work on it, if I wanna make it to the track by Friday (1st time going to the track...I can't miss it!!).

 

[NOSLO2PT0]

you mean the bolt on the intake manifold for the throttle cable? Yes, that's fine. The throttle body opens & closes at 0 & 100%, so that's good.

No, I don't mean that. It's on the throttle body. If you are looking at the throttle body from the front of the car, it will be directly to the left of the spring where the throttle cable connects to. It has a black wire running off it. If you remove that black wire, there will be a single terminal sticking straight up. Tehre is a locknut on the bottom. make sure that is adjusted correctly.

Where exactly is the brake booster?? Is it on the very bottom of the intake manifold, on the side...? Is it viewable without taking out the wiring harness or anything, I'd really hate to have to take my IM out just to look under it. Thanks!

You need to learn your engine bay. http://members.shaw.ca/dsm.1000q/Engineprimer/Q2.htm Brake booster is the big black circular thing below and the right of the brake reservoir.

 

[a_scobel]

No, I don't mean that. It's on the throttle body. If you are looking at the throttle body from the front of the car, it will be directly to the left of the spring where the throttle cable connects to. It has a black wire running off it. If you remove that black wire, there will be a single terminal sticking straight up. Tehre is a locknut on the bottom. make sure that is adjusted correctly.





You need to learn your engine bay. http://members.shaw.ca/dsm.1000q/Engineprimer/Q2.htm Brake booster is the big black circular thing below and the right of the brake reservoir.

Hm you mean this? http://members.shaw.ca/dsm.1000q/Engineprimer/idleswitch.htm I don't have that on my car.

 

[NOSLO2PT0]

Why the hell not???? That's what tells your ECU you are idling!! No wonder your car wants to idle at 2300rpm.

 

[a_scobel]

Why the hell not???? That's what tells your ECU you are idling!! No wonder your car wants to idle at 2300rpm.

1G & 2G TBs are different. 2G TB:

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[a_scobel]

Okay I just ohmed out my TPS...it's showing OL. So I'm pretty sure I found it...when I disconnect the harness from it, and turn on the ignition, the car won't surge anymore, but will still idle at about 2000 rpms.