power loss, I'm getting desperate. Beginning to consider a nice tall bridge!
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From: Weston, Ma, US
power loss, I'm getting desperate. Beginning to consider a nice tall bridge!
Allrighty I have an '89 firebird with a 305 TBI which I converted from automatic to manual. When I first start the car, it feels great, however after I drive it around for about 10 min, the car goes from feeling like an F1 car, to being slow and sluggish. Here are some examples fo what I am talking about:
My street is a nice long, straight road and I use it to do 0-60 runs w/ my G-tech, its nto terribly accurate but it works very well for car specific things. (I.E. telling if a mod did soemthing....). Yesterday I turned the car on, pulled out of my driveway and did 0-60 in 6.5 seconds. I drove around town (picked my brother up, did the usual thing), adn went back to the same exact spot on the road. I then proceeded to repeat the same exact 0-60 run, on the same stretch of road, with the same amount of revving and clutch dropping, and I ran 8.4 seconds.
Another way to bring it uot is a clutch dump. If I rev the engine to 4 grand and just take my foot off the clutch I get an awesome smoke show when the car is cold. If however I do so when the car has been on for awhile, the moment I let the clutch out the revs just fall and the car bogs.
I have replaced all 8 plugs, and all 8 wires. My rotor is in perfect working condition and the cap has less than 100 miles on it. I have replaced the o2 sensor and the temperature sensor.
I still have the automatic ECU in the car, but I do not believe that makes a difference.
I was wondering if anybody had any ideas waht to do from here? I was thinking about giong to a GM dealer and asking them to plug it into a computer and see if they can find somethign wrong. I get no SES codes, but I imagine they could tell if soemthing was horribly wrong? At this point I'd be willing to spend anything or take it to anybody to get this fixed b/c the car drives so well when I first start it.
Any ideas at all?
I'd be so grateful for anything that I'd be willing to name my children after you!
-- Henry
My street is a nice long, straight road and I use it to do 0-60 runs w/ my G-tech, its nto terribly accurate but it works very well for car specific things. (I.E. telling if a mod did soemthing....). Yesterday I turned the car on, pulled out of my driveway and did 0-60 in 6.5 seconds. I drove around town (picked my brother up, did the usual thing), adn went back to the same exact spot on the road. I then proceeded to repeat the same exact 0-60 run, on the same stretch of road, with the same amount of revving and clutch dropping, and I ran 8.4 seconds.
Another way to bring it uot is a clutch dump. If I rev the engine to 4 grand and just take my foot off the clutch I get an awesome smoke show when the car is cold. If however I do so when the car has been on for awhile, the moment I let the clutch out the revs just fall and the car bogs.
I have replaced all 8 plugs, and all 8 wires. My rotor is in perfect working condition and the cap has less than 100 miles on it. I have replaced the o2 sensor and the temperature sensor.
I still have the automatic ECU in the car, but I do not believe that makes a difference.
I was wondering if anybody had any ideas waht to do from here? I was thinking about giong to a GM dealer and asking them to plug it into a computer and see if they can find somethign wrong. I get no SES codes, but I imagine they could tell if soemthing was horribly wrong? At this point I'd be willing to spend anything or take it to anybody to get this fixed b/c the car drives so well when I first start it.
Any ideas at all?
I'd be so grateful for anything that I'd be willing to name my children after you!
-- Henry
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theshackle
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Sep 17, 2020 08:26 AM