problem on my 3.1 V6, need help!

[michi]

Okay guys, my engine had a leaking throttle body coolant hose which i replaced with the "bypass heater mod." now my problem is that my engine has a really rough idle and revs up without touchin the gas pedal. What i did is:
I took off the throttle body, disconnected the pedal lines, disconnected wires from IAC and TPS sensor. Then i put a coolant hose in there to bypass the throttle body. Put everything back and now when i start the engine it idles really rough and when i drive it, it revs up to 4k or so without thoughing the pedal.

i have to see what my laptop says later but thought i ask here to be sure.
What i was thinking is that the TPS sensor is bad?? I checked for vaccum leaks and checked the throttle body and IAC plate gasket, they are not that great but that should work. Also i replaced the IAC sensor but still didnt helped.

[3X00-Modified]

Gaskets can't be "not that great" and work... You need to check for a vac leak because it definately sounds like you have one.

[Wanako]

Gaskets can't be "not that great" and work... You need to check for a vac leak because it definately sounds like you have one.

+1 Definetely sounds like a Vacuum leak. If you're talking about the 3.1 and not the 3100, they have VERY FRAGILE vacuum lines that break easily. Look at all the lines to make sure nothing is broken or unplugged.

[michi]

Thanks for the fast replys. I checked all vaccum lines and they are just fine. Even took off the intake to see if they are okay...
I also noticed the throttle is very sensitive .. when i just touch it some, it reevs up to 3k.

I just hooked up my laptop and it says code 33 (MAP - high). So that means there is still a vaccum leak which could be the plate where the IAC is bolted to? or does the MAP sensor fail?

[Wanako]

MAP sensor CAN fail, but before you replace it, there is also a vacuum line that goes to the MAP sensor, check if that's connected. It may have come off.

[michi]

The vacuum line is connected to the MAp sensor, already checked that. I just noticed that it has a leak on the IAC plate which i put some sealing material to it since the original gasket is in 3 pieces... it seems to run a little bit better in idle but still revs the engine up to 3k when i drive it. Seems like i really have to wait for the throttle body gasket set, then i can replace all gaskets there.

[Wanako]

That could definitely be it. If your gaskets are bad and letting air in, it could be the vacuum leak you're experiencing. So yea, try that, changing those gaskets and then tell us if it worked out. The ONLY reason I can think of an engine going up that high RPM is a massive Vacuum leak. When I had a similar problem it only went up to like 1500-2000 RPM which is weird...

[SuzukiGhostRider]

The only "gasket" on an IAC is the rubber o-ring that goes around it where it slides in. Either that is kaput, you're missing it, or your TB or Intake gasket is leaking. Spray a can of carb cleaner around the intake where it seals up and the TB and the IAC. When the motor dips idle you've found your culprit.

[Wanako]

The only "gasket" on an IAC is the rubber o-ring that goes around it where it slides in. Either that is kaput, you're missing it, or your TB or Intake gasket is leaking. Spray a can of carb cleaner around the intake where it seals up and the TB and the IAC. When the motor dips idle you've found your culprit.

this.

[michi]

I have the O-ring in on the sensor. The part where its leaking is that plate where the vacuum lines are put in... I already sprayed alot of carb cleaner around and found that its pretty sure that plate where the vacuum lines are put in... i just dont know how its exactly called, lol. I also sprayed around the IAC and its just fine there, some around the throttle body and engine reved up a bit so this gasket and the one of that plate seems to be replaced. I just wonder why its still leaking when i put sealant on there...

i googled this picture where you can see it:


There you can see that plate where the IAC is mounted to and the vacuum lines are connected.

[SuzukiGhostRider]

That "plate" you're referring to is the Throttle Body. You appear to be missing a vacuum line connected. I see 3 going under the upper intake plenum which is good, but there should be a 4th going to the EGR (Exhaust Gas Recirculation) valve behind the motor on the firewall side of the TB.

[Wanako]

That "plate" you're referring to is the Throttle Body. You appear to be missing a vacuum line connected. I see 3 going under the upper intake plenum which is good, but there should be a 4th going to the EGR (Exhaust Gas Recirculation) valve behind the motor on the firewall side of the TB.

Mike, motors with the Digital EGR don't have that fourth Vacuum line coming from the Throttle Body. The Vacuum EGRs do though. I think only the 87s and 88s had the Vacuum EGR.

[SuzukiGhostRider]

Oh, snap. Yup, didn't even look and realize he had the digi EGR. No year listed for the car and I didn't snap to the pic until you mentioned it. Ooopsy...

[Wanako]

I got your back.

[michi]

Just to say, this is not my picture but my engine looks the same
That plate can be taken off with 4 or 5 torx bolts and that i took off... i better shouldnt have do that cause its now leaking...
but thanks for the help guys, seems like i have to wait for the gaskets