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Can someone give me some signs of a TPS going bad? My car is surgin RPMs at stop lights. Jumps to 2k then drops back to 900 rpm. That idle is high too. Anyone?
Thanks gang
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'98 SVT - modded
-15.01@91.8
'95 Suzuki GS500E
-faster than the above
---wanting a Speed Triple or Superhawk badly
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Joined: Aug 2000
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NP-T Speed Factory Intake
Magnaflow Race Canisters
NP-T Sniper Intake Pipe
Optimized 4.6 GT TB
Vision Driving Lights
Lo-Tek Pillar Pod
FMS Blue Wires
Clear Corners
Short Shifter
Side Markers
Bullit Door
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Joined: Sep 2000
Posts: 7,329
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That's not your TPS. Bad TPS normally causes a stumbling on initial acceleration. It's very easy to check with a multimeter!
I'd check and clean the MAF & IAC valve. Plus look for intake leaks... Those correlate to erratic idle.
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Originally posted by DemonSVT:
That's not your TPS. Bad TPS normally causes a stumbling on initial acceleration. It's very easy to check with a multimeter!
I'd check and clean the MAF & IAC valve. Plus look for intake leaks... Those correlate to erratic idle. Thanks Demon! Gonna clean em both this weekend.
NP-T Speed Factory Intake
Magnaflow Race Canisters
NP-T Sniper Intake Pipe
Optimized 4.6 GT TB
Vision Driving Lights
Lo-Tek Pillar Pod
FMS Blue Wires
Clear Corners
Short Shifter
Side Markers
Bullit Door
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Joined: May 2000
Posts: 4,042
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Why did you edit your post Dark Side?
'98 SVT - modded
-15.01@91.8
'95 Suzuki GS500E
-faster than the above
---wanting a Speed Triple or Superhawk badly
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Joined: Aug 2000
Posts: 508
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Originally posted by JVT:
Why did you edit your post Dark Side? Cause I was even questioning if it was the TPS...sounds like my gut feeling was right. But I do appreciate the link! I'm gonna try out the IAC and MAF cleaning...and if that still doesnt work, then its TPS time.
NP-T Speed Factory Intake
Magnaflow Race Canisters
NP-T Sniper Intake Pipe
Optimized 4.6 GT TB
Vision Driving Lights
Lo-Tek Pillar Pod
FMS Blue Wires
Clear Corners
Short Shifter
Side Markers
Bullit Door
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Joined: May 2000
Posts: 4,042
Moderator
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Originally posted by Dark Side SVT:
Cause I was even questioning if it was the TPS...sounds like my gut feeling was right. But I do appreciate the link! I'm gonna try out the IAC and MAF cleaning...and if that still doesnt work, then its TPS time. Okey doke, just curious. John
'98 SVT - modded
-15.01@91.8
'95 Suzuki GS500E
-faster than the above
---wanting a Speed Triple or Superhawk badly
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Joined: Oct 2000
Posts: 174
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Surging RPMs is probably not the TPS.
A bad TPS will typically cause the engine to totally lack power (almost die)when accelerating. This is caused by noise
on the TPS signal that causes the PCM to send the wrong amount of fuel to the engine for the throttle opening.
Surging RPM is more likely to be caused by the following.
Vacuum leak.
Dirty Fuel injectors/ Intake manifold
/throttle plate /IAC.
lose/dirty electrical connections on EEC sensors or a bad sensor.
the first thing to do is check for any codes.
hope this helps
jeff
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Have to agree with everything mercman says.
I had a similar problem on my 1993 Mondeo 1.8LX (UK spec). No fault codes were logged and as you can imagine it tracking down the fault was like looking for a needle in a haystack. A very close inspection of the wiring to various sensors revealed that one of the wires to the PAS pressure sensor had broken internally (check for this by feel) and the insulation had started to deteriorate. This had led to the wire making and breaking contact thus giving the ECU false information, leading to surging at idle. Easy to fix (10 minutes with a soldering iron) but difficult to track down.
Rather than instantly blame a particular component as being faulty (even if a fault code readout points to that component) it pays to be systematic when diagnosing tricky problems like these. Thinking through the situation logically, the areas to check, as highlighted by mercman, could all cause surging at idle. Check everything (especially wiring and connectors to all sensors) very closely indeed.
Good luck.
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