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Old 07-12-2014, 12:24 AM   #1
scw2
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1997 SW2
1999 SC2
Default loss of power

Ok so the other day i ported and polished a throttle body for my 97 sw2 5 speed. I had to swap the vacuum plugs for my throttle body from the purge valve to make it function. It seemed to work. But it gradually seemed to lose power. Now acceleration is horrible. Im not sure if the vacuum line swap could be causing this or if the platinum in the cat happened to fall apart around the same time i did the swap. The pick up is horrible, it is ok if u find the sweet spot in the pedal. The car also seems to surge when im up to speed. This is pretty consistent, but is sometimes worse than others. HELP PLEASE!
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Old 07-12-2014, 08:40 AM   #2
2NDSOUT
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1994 SL2
1999 SL
Default Re: loss of power

I'm not sure what you mean by "Vacuum Plugs"... if the car is losing power I would verify that the Throttle Position Sensor is still good, and the plugs are properly gapped at .040

What is the condition of your EGR valve (it's electronic on the 97 model year) and have you removed the EGR valve and covered that port with some a piece of an aluminum can to see if it runs any better.

Also- don't run Platinum plugs in your engine. The Platinum plugs burn hotter and are not recommended in the S-Series engine. There are quite a few post debates back and forth about people saying that they are good- but I have run regular NGK plugs in my S-Series cars for almost 20 years without any issues.

I would check that your lines are all good and that you don't have any leaks.
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Old 07-12-2014, 08:48 AM   #3
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2001 SC2
Default Re: loss of power

Swapping to a '93-'95ish TB on a '95ish-'99 (not 100% sure year of change, probably with the change to adjustable FPR in '95) means you also have to swap the vacuum harness.
The main problem I see with doing that, is the big line goes to the FPR and the change in the harness puts it on the opposite side of the throttle plate. This means the FPR will be acting different than expected. If I could be sure I swapped the TB on my '96, I'd blame that change in the way the FPR works on what I suspect is a burned valve in the engine.
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Old 07-12-2014, 09:19 AM   #4
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Default Re: loss of power

No i havent done anything different with the egr valve. Plugs are gapped right ngk r's. Would a burnt valve come from a short supply of fuel? Or to much air?
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