1994 Pontiac Grand Prix Fuel INjection problems.

Tiny
AWHITEFUNERAL
  • MEMBER
  • 1994 PONTIAC GRAND PRIX
1994 Pontiac Grand Prix 6 cyl 134000 miles

Hey, I recently replaced my coolant temp sensor, that's located by my thermostat on my 3.1 V6. And now the engine tries to kill itself. It runs at about 4000Rpms continuously. If you guys could give me some info, or step by step instructions on how to fix this, that'd be great.
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Saturday, May 31st, 2008 AT 9:29 AM

7 Replies

Tiny
MERLIN2021
  • EXPERT
What was it doing before you changed the ECT? Is ses light on?
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Saturday, May 31st, 2008 AT 1:33 PM
Tiny
AWHITEFUNERAL
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Ummm, the fans weren't kicking on, so I had the fuses tested, and the relay's fine, and I hooked the fan motors up, and they worked just fine, but the car would heat up about 220 210, and steam would start building up out of the radiator near the cap.I replaced the thermastat about a week ago, and it worked fine, but ever since i've had new headgaskets put in it, it's temp goes up and down, it used to hit about 250 260, then it would fly back down to about 120 then do it all over again. And i've lived with it, but haven't had it checked out. It's not worth checking out.I bought it for 500 bucks. So.I don't know.I've tried to relieve the fuel pressure by taking out the fuel pump fuse and running it until it stalls, then cranking it a few seconds, then unhooking the battery, then trying it again, but the same things happens, it hits 4000 rpms and stays there. What do you think is wrong?
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Saturday, May 31st, 2008 AT 1:40 PM
Tiny
MERLIN2021
  • EXPERT
At this point I would be checking all things throttle related, the cable for binding, remove it from the throttle see if the idle goes back to normal by operation the throttle by hand and letting go of it, cleaning the throttle bore, checking the IAC for excess carbon, see if the TPS operates smoothly with a voltmeter.
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Saturday, May 31st, 2008 AT 7:47 PM
Tiny
AWHITEFUNERAL
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Well, i've pretty much looked at everything, but I read in a book that I should relieve the fuel pressure before taking out the CTS, but I didn't. And i've tried relieving the pressure now, but no dice.I'll look over everything tomorrow though. Again, there might be something I missed, but I don't think so. Would it matter if I unhooked the sensor on the fuel tank, instead of the fuel pump fuse?
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Saturday, May 31st, 2008 AT 8:13 PM
Tiny
MERLIN2021
  • EXPERT
You mean the connector? It would be easier to pull the relay out of the underhood fuse block.
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Saturday, May 31st, 2008 AT 8:35 PM
Tiny
AWHITEFUNERAL
  • MEMBER
Well, i've checked the fuses, and have taken them to a local auto parts store, and they tested em and said they were fine.
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Sunday, June 1st, 2008 AT 4:08 PM
Tiny
MERLIN2021
  • EXPERT
Try checking for any stored codes...


http://www.2carpros.com/forum/automotive_pictures/62217_95_OlderGM_26.jpg


Cross these two terminals as shown, then turn the key on. Count the flashes, a 22 will flash as 2 flashes then a short pause, then 2 flashes, if more than one code is stored, the pause will be longer. The codes will display three times and end with 12. Write them down and post here. This connector is right under the middle of the dash...
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Monday, June 2nd, 2008 AT 5:22 AM

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