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i replaced the tps yesterday and it didn’t solve the problem. i put it into neutral and revved it up a little bit to 1200rpms and after about 1-2 seconds the engine lost power down to under 1000rpm and i didn’t move the pedal. when I’m driving at a constant speed it does that also but i have about a 1-2 inch play before overdrive kicks in.
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Like engine size, mileage, Any other work that’s been done. What happens when you step hard on the gas?
I’d start with a fuel pressure test. But yes, engine size, anything previously done before the problem? Give as much info as possible, or its too hard to narrow down a problem.
its a 3400 sfi v6, the mileage is around 166000 on the engine, the head gaskets were changed already. the coil, wires spark plugs, throttle position sensor, and fuel filter were all replaced. the last pressure test i did was at fifty psi at 700 rpms. when i step hard on the gas, the car shifts perfectly up till third gear where the power is lost usually around 40-45 mph. and occasionally when going into overdrive, the car surges from 2200 rpms to 2500 rpms. if theres anything else that you like to know id gladly give it out cause this problem is really bugging me. Thank you.
If it runs and shifts great up to 3rd gear, then acts up, hate to say it, but it points to a tranny issue. Are the shifts smooth? When it does its thing, what’s the response when you give it gas? Does it perform normally otherwise? Will it go into overdrive? Oops, just read it does go into over drive. Does the rpm go up or drop?
YEAH…That’s the kind of info we need. It’s possible that it has a partially plugged catalytic converter or a fuel flow/pressure problem. You might try driving the car with a fuel pressure gauge installed mounted in a spot (possibly under the wiper blade) where you can watch the pressure when it acts up.
yeah the shifts are nice as they should be. the response is that there is barely any response. when i push the pedal in slowly theres barely any rpm change except when it engages into overdrive. theres about a 1-2″ play with not very much response. the rpm gauge drops when it happens. it sounds like it shifts up and the rpms change but theres only four gears to go through so that can’t be it. other than that i just need new tires but that shouldn’t affect that.
[quote=”alexschmitty” post=74854]yeah the shifts are nice as they should be. the response is that there is barely any response. when i push the pedal in slowly theres barely any rpm change except when it engages into overdrive. theres about a 1-2″ play with not very much response. the rpm gauge drops when it happens. it sounds like it shifts up and the rpms change but theres only four gears to go through so that can’t be it. other than that i just need new tires but that shouldn’t affect that.[/quote]
It shouldn’t engage OD while depressing the gas pedal. Have you checked the TPS?
[quote=”shaun” post=74856][quote=”alexschmitty” post=74854]yeah the shifts are nice as they should be. the response is that there is barely any response. when i push the pedal in slowly theres barely any rpm change except when it engages into overdrive. theres about a 1-2″ play with not very much response. the rpm gauge drops when it happens. it sounds like it shifts up and the rpms change but theres only four gears to go through so that can’t be it. other than that i just need new tires but that shouldn’t affect that.[/quote]
It shouldn’t engage OD while depressing the gas pedal. Have you checked the TPS?[/quote]
He already said the TPS was replaced…..
-Karl
Yes he did, but did he check this one? You wouldn’t believe how many parts I replaced and bad to begin with. His idle surges and it goes into od while giving it gas. So that’s where I would start
Not arguing, everything is possible. I just don’t understand how 3rd gear and OD is only effected by a restricted exhaust? No problems through all rpms up til then. What am I missing?
My reply would be referencing his first post about how he was losing power when he was just revving his engine….. True, this could be a TPS issue…. When the TPS was replaced I discounted that….. Not to say you can’t get a bad part (we all have seen our share of them)…. But he has lost pedal and when the engine is winding out at higher RPMs, a restriction will cause issues in higher gears due to higher engine RPMS… While I cannot account for his driving habits, or how high he pushes it to 3d, the chances of replacing a TPS and being another bad one are remote (but not impossible)… Couple this with a 13 year old vehicle which has recent engine work (for god knows what) and not knowing when the Cat was replaced (if ever) The Cat/exhaust system could be fouled or bad and causing this…. JMHO, I would suspect a fuel line kinked (delivering pressure but not volume) before I moved to a trans issue, but that is what I see….
What say you…
-Karl
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