Knucklehead97 Posted May 16, 2015 Posted May 16, 2015 Has anyone ever had trouble with aftermarket Renix TPS's? When this problem with my Jeep started, the first thing I changed was the TPS. Because my factory one was failing. With the factory TPS the truck would try to stall out EVERY rev of the engine. So then I bought an Airtex one. The Airtex lasted a total of... 10 minutes. Would have to be adjusted every time I turned off the engine. Worked fine after adjusted. But as soon as the engine turned off it had to be adjusted again or the engine would stall after revved. Now, I have a Standard Motor Products one. Not the cheap "T" series, but the slightly more expensive Auto tranny one (my Jeep is a stickshift though). And now the Jeep will only stall out if warmed up, turned off for about 10 minutes, and cranked again. Then it only stalls the first time its revved. And I have a seemingly low idle with slight backfires when warmed up. I've checked and changed almost everything else on this Jeep that could cause this problem. And my mind just keeps going back to ANOTHER aftermarket TPS being faulty. But the TPS passes the test. It can be adjusted to the correct setting and everything. Has anyone ever had a problem with aftermarket TPS's? I know that aftermarket CPS's are a no no. What about the TPS? Thanks!
Knucklehead97 Posted May 16, 2015 Author Posted May 16, 2015 CPS checked out perfectly. Even when warmed up and cooled off a little bit.
cruiser54 Posted May 16, 2015 Posted May 16, 2015 I had a Napa one fail on me. Ever tried running it with the TPS disconnected?
Megadan Posted May 16, 2015 Posted May 16, 2015 I've been running my Standard Motor Products TPS for over a year now with no problems.What kind of resistance are you getting on the TPS ground? Some of the problems you are describing sounds more like a fuel related issue. Very similar to the problems I was having when the hose from my pump to the hanger was not seated.
Knucklehead97 Posted May 16, 2015 Author Posted May 16, 2015 Mopar is what I should have gotten but I was trying to save a buck... I checked the resistance when all of tbis started and it was how it should be. Didn't fluctuate when I wiggled the wires, either. I've changed the entire fuel system. Pump, sending unit, regulator, injectors, and filter. The problem was happening before I changed the pump but I do need to check the line. I made sure it was tightened good when I installed it but who knows, stuff can.happen. And running with the TPS disconnected? You can do that? I didn't know it would run without.
cruiser54 Posted May 17, 2015 Posted May 17, 2015 Mopar is what I should have gotten but I was trying to save a buck... I checked the resistance when all of tbis started and it was how it should be. Didn't fluctuate when I wiggled the wires, either. I've changed the entire fuel system. Pump, sending unit, regulator, injectors, and filter. The problem was happening before I changed the pump but I do need to check the line. I made sure it was tightened good when I installed it but who knows, stuff can.happen. And running with the TPS disconnected? You can do that? I didn't know it would run without. Trust me............
Knucklehead97 Posted May 17, 2015 Author Posted May 17, 2015 Mopar is what I should have gotten but I was trying to save a buck... I checked the resistance when all of tbis started and it was how it should be. Didn't fluctuate when I wiggled the wires, either. I've changed the entire fuel system. Pump, sending unit, regulator, injectors, and filter. The problem was happening before I changed the pump but I do need to check the line. I made sure it was tightened good when I installed it but who knows, stuff can.happen. And running with the TPS disconnected? You can do that? I didn't know it would run without. Trust me............ I just got my new throttle body installed so I might try tomorrow. Anything I should expect or be looking for while it runs without a TPS?
Knucklehead97 Posted May 17, 2015 Author Posted May 17, 2015 I cranked it up. Didn't let it warm up or anything. But it was... different. Seemed to have a stronger exhaust fume and when I pressed the throttle pedal it had a hesitation.
Knucklehead97 Posted May 17, 2015 Author Posted May 17, 2015 So it runs better or worse unplugged? Worse for sure.
Fernando87mj Posted May 17, 2015 Posted May 17, 2015 Cruiser , don't you think it might be the coolant temp sender ? He said that the engine runs worse when warmed up . You know best and I would like to know your opinion on the temp sender .
Knucklehead97 Posted May 17, 2015 Author Posted May 17, 2015 I tested the ohms on the coolant sensor and got 320 ohms when warmed up. I THINK thats within spec. Not 100% sure though.
Knucklehead97 Posted May 17, 2015 Author Posted May 17, 2015 320 ohms was at like 210*. So could that be a problem?
cruiser54 Posted May 17, 2015 Posted May 17, 2015 Take a reading when your needle just begins to move for fun. And/or unplug the CTS and start it cold....
Knucklehead97 Posted May 17, 2015 Author Posted May 17, 2015 I will try both when I get the chance. Gotta adjust the TPS again sense I installed the bored out TB. I need to test the IAT while I'm at it. Where can I even purchase a CTS or IAT? Can't find them anywhere.
cruiser54 Posted May 17, 2015 Posted May 17, 2015 I thought you could get CTSs.... IATs may be swapped with one that has a different connector. Tip of the IAT can be cleaned carefully with brake or carb cleaner.
Knucklehead97 Posted May 17, 2015 Author Posted May 17, 2015 I can't find either of them for sale anywhere. I'll get around to testing them ASAP. It makes sense that the CTS could be causing my little backfires considering my idle gets rougher as the temperature raises.
cruiser54 Posted May 17, 2015 Posted May 17, 2015 Test them both. The IAT is gonna be kind of difficult though.
Knucklehead97 Posted May 17, 2015 Author Posted May 17, 2015 Because theres no for sure way to know the intake air temp, correct?
cruiser54 Posted May 18, 2015 Posted May 18, 2015 Because theres no for sure way to know the intake air temp, correct? Yeah, sorta. First thing in the morning before starting it would be good. should be the same temp as the surrounding air...
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