dr. joint 0 Report post Posted December 19, 2009 Cleaned my spark plugs, adjusted the accelerator cable tension (coz it looked like it had a lot of slack) and started the car. All is well when suddenly the check engine light comes on. 5 seconds before having a panic attack i stepped on the gas pedal to rev the engine and the light comes off. After releasing the gas pedal and the engine back to idle, the light comes on again. Ah! It's the TPS! After numerous adjustments and road tests the car is well again. Question: where does the signal of the TPS go? To the CPU? What's the worst that could happen when the TPS is not properly adjusted? So far a slight shudder at idle and a slight hesitation to shift (A/T) was all i encountered. It feels as though the engine and the tranny are having a hard time to get together (like bobby and whitney lol) Whats the worst case scenario? Quote Share this post Link to post Share on other sites
bfeeney 0 Report post Posted December 19, 2009 Yeah, they all go straight to the CPU, then sent to the injectors. As far as a totally dead TPS, I've never seen one. I've replaced failing ones (and the car was running like shit) but never a dead one. Quote Share this post Link to post Share on other sites
Ghost 0 Report post Posted December 19, 2009 your TPS signal goes to your ECU which than also goes to your transmission so it knows when to shift (Throttle pressure (from the TPS) exceeds governor pressure (road speed) = upshift and vise versa for a down shift) Quote Share this post Link to post Share on other sites
bfeeney 0 Report post Posted December 20, 2009 your TPS signal goes to your ECU which than also goes to your transmission so it knows when to shift (Throttle pressure (from the TPS) exceeds governor pressure (road speed) = upshift and vise versa for a down shift) Your right, I didn't even think about the tranny on that, I just thought about the engine. But wouldn't that be indirectly correlated with the TPS? I thought the torque converter and valve body did 90% of the shifting then the electronic did the other 10%. Tranny's really haven't changed since the '60 or so (a 700R-4, T5, T56, TH400 is still the same) Quote Share this post Link to post Share on other sites
dr. joint 0 Report post Posted December 22, 2009 Thanks for sharing ur knowledge guys! Hmm..before adjusting the TPS i gave the car a road test and it did feel like a faulty tranny! It's like trying to shift gears on a manual with a sliding clutch! But after adjusting it all is well. But it did give me a scare. Quote Share this post Link to post Share on other sites
Ghost 0 Report post Posted December 26, 2009 Your right, I didn't even think about the tranny on that, I just thought about the engine. But wouldn't that be indirectly correlated with the TPS? I thought the torque converter and valve body did 90% of the shifting then the electronic did the other 10%. Tranny's really haven't changed since the '60 or so (a 700R-4, T5, T56, TH400 is still the same) The torque converter is just a fluid filled clutch that allows slip depending on your engines RPM's (which depends on the pitch or AKA angle of the fins inside) and the valve body actually does the shifting because it's the final step, it routes the fluid to the correct band or clutch pack which causes your shift. valve body did 90% of the shifting then the electronic did the other 10% without the electronics the tranny wouldn't know when to shift, you would be stuck in one gear 1st or limp home mode as many techs call it, its what the tranny defaults to if there is ever a problem. Your right Oh WOW that dosent happen very much Quote Share this post Link to post Share on other sites
