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#1
11-23-2008, 02:52 PM
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2000 Grand Prix GT - no power
Have a GT 3.8L -no s/c with 224000 miles. Car is great however in the last month it has been getting steadily worse. Engine has been running rough & shaking under acceleration. Now after a couple of miles the TEMP light comes on, and it feels like something lets go in the engine, it has no power and idles poorly.
Could this be a cat converter issue (blockage). It has had full tuneup (new plugs, wires & coil packs have been checked). After cool down it runs well for a few miles and then repeats. Please advise 
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#2
11-23-2008, 04:41 PM
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Re: 2000 Grand Prix GT - no power
Is the motor overheating?, and check your Idle Air Controller, i had trouble with my idle and i cleaned it up and it was fine.
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2003 Pontiac Grand Prix GT 3800 Series II V6
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#3
11-23-2008, 04:46 PM
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Re: 2000 Grand Prix GT - no power
I'd take a hard look at the cooling system...have you ever refreshed the Dexcool coolant?
While it's apart I think you have to look at blockages in the radiator and heater core...use a garden hose to flush thru these and check the presence of absence of flow. I would change all the soft hoses as a planned maintenance item and also the thermostat if it was my car.
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1988 Chevy R-30 1 ton DRW pickup (217k) 1991 Chevy S-10 4WD pickup (192k) 2000 Grand Prix GTP (218k) 2002 GMC Yukon (185k) 2009 G8 - GT (46k)
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#4
11-24-2008, 12:11 AM
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Re: 2000 Grand Prix GT - no power
have the UIM/LIM gaskets been changed? this may be your problem...
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#5
11-24-2008, 10:08 AM
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Re: 2000 Grand Prix GT - no power
Let's get some more info before speculating any further.
1. Is your check engine light on? If so, have you scanned it to pull the codes (post the results if the answer is yes)? 2. Are you mysteriously losing coolant? 3. Does the temp light come on after a couple of miles of driving even if the car isn't warmed up?
__________________
 Still waiting for the "good old days" I'll get to bore my future grandchildren with!
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#6
11-26-2008, 08:17 PM
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Re: 2000 Grand Prix GT - no power
Had cat converter changed. TEMP light no longer comes on. Engine (car) still shakes under power. Now engine revs up to 2000 - 3000 it does settle down after awhile. Check engine light has not come on. Engine coolant levels are fine have not lost any fluid. Engine does not overheat. Just runs like crap>
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#7
11-27-2008, 01:20 AM
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Re: 2000 Grand Prix GT - no power
unplug the maf and start it up.
Also is it just coincidence that you replaced the cat and now the temp light stays off? seems weird.....
__________________
-2000 Grand Prix GTP 170,000mi (daily driver) -2000 Olds Alero 100,000mi (soon to be DD with gas at $3.45/gal) -1997 Chev K1500 4x4 115,000mi (Natalie's truck [nans_grandprix]) AF "2.0" Community Guidelines Conservative Victory 2012!!! "I'll Keep my Guns, Freedom, and Money. You can Keep the Change!" ----->>>>> Did You Know? <<<<<-----
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#8
11-28-2008, 01:09 AM
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Re: 2000 Grand Prix GT - no power
Vacuum hoses can cause rough running also.
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97 Grand Prix GT 360,000 miles as of 02-01-09 391 000 miles as of 11-17-11 400,000 miles as of 3-15-13 01 Duramax/Allison 07 G6 convertible
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#9
11-28-2008, 08:09 AM
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Re: 2000 Grand Prix GT - no power
As Tblake suggested, unplug the MAF and see if it runs better. If it does, you need a MAF sensor.
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Still waiting for the "good old days" I'll get to bore my future grandchildren with!
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#10
11-28-2008, 09:40 AM
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Re: 2000 Grand Prix GT - no power
Ok guys, thank you for your help. Finally got car to give up a DTC P0118. Changed the ECT (electronic coolant sensor) $40.00. Problem solved.
It was also a partially plugged Cat Converter that I changed. Faulty ECT effects fuel injection causing engine to run rough.
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