Jason_GTA

I don't know what is wrong with my car. For some reason it has lost alot of power. Mostly in the higer RPM's 3500 and above. Say I am going 45 miles an hour, if i put the pedal to the floor, my car downs shifts and the car slows down. It kind of feels like i have the brake on while trying to accelerate but it only does this on higher rpm's. Although i have noticed a major power drop all around. I took apart my intake to see if maybe it was clogged and it all seemed good. Has this ever happened to any of you and or do you know what my prpblem could be. I have no idea what is wrong.
ANY HELP WOULD BE GREATLY APPRECIEATED.


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1988 Pontiac GTA
Loaded
350 700R4

rondubbs

are you getting any codes?

RP1987GTA

sounds like the catylic convertor my be blocked

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87GTA,350,Auto,MAF screens removed,195 thermostat,cold start injector UNPLUGED,K&N,modified air intake,ADSchip,3:70s,3inch cat back Flowmaster single outlet,TPS.54,Bosch Plat plugs,base timing 6BTDC,22 MPG and runs like a bear,Bilstiens in the rear....,don't let yer meat loaf

Jason_GTA

How do you unblock it. Its it just clogged. SHould i go under there unblot it and poke th holes. I never had to clean out a cat before
Jason

RP1987GTA

how many miles on this car?I would replace it ..if its blocked.To ck if its blocked you can do a visual check ..take it off look inside it see if its melted or damaged if it is you may have a sensor or computer problem that needs repair also.While its off wire the exhaust pipe up (so it doesn't drag on the ground)drive the car ...see if the problem is gone

dudelovett

Definately your cat. I had the exact same thing with my V6. Id also change my O2 sesor while replacing the cat. The O2 sesor was the reason my cat got all messed up to begin with.

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1991 Firebird Formula, 305, TPI, Auto...stock till I get some money!!!
Former owner of an 88 2.8 Firebird....RIP

[This message has been edited by dudelovett (edited October 26, 2000).]

RP1987GTA

if you have a vacuum gauge hook it up to manifold vacuum....where the fuel pres.reg is connected is fine,then with the car in park slowly rev the engine up to about 2500 rpms ...watch the gauge ...it should stay steady or rise ...if it drops lower,the cat or exhaust is blocked...this test is more for an expereinced wrench...but a dam good one

88IROCs

I had similiar problems minutes before my fuel pump left this world. Hopefully, it's nothing that serious, but it sounds like a fuel flow problem(filter may be clogged). At the time the car had TES headers and Flowmaster catback, with a 3" i.d. straight pipe where the cat used to live(I was waiting for a new cat from Jeg's), so I knew I wasn't having a problem with exhaust restrictions.

Also, a few month's before the pump failed, in an extended fit of absentmindedness I allowed the fuel level to drop well below "E". The result was: the engine hesitated when moving away from a stop, and going around one corner I uncovered the fuel pickup, with the result that the engine almost stalled, downshifted from second to first, and accelerated very poorly.

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He who hesitates,... is lost!

DEEPSOUTH90RS

I agree with the cat theory. My cat clogged up on me about six monthe ago.It would accelerate fine if you were slow, but over 4,000 it acted like I threw an anchor out the window! If you dont change it soon, (I waited untill it wouldnt run) it will get to the point where it will not run at all,and this can cause a fire as well due to a huge buildup of heat. Then it blew the manifold gaskets when I tried to force it to run. Save yourself time&money,replace it now. This was just my experience, but it sounds exactly like the problem you are having.

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90 RS
T-TOPS
3.1 V6

RUNS STRONG AT 187,650
ON ORIGINAL ENGINE
Just got A 91rs W/blown 305, this is my first project car.So, I really need advice.ANY is appreciated!