So my 2005 QC at idle in drive has an annoying surging about 100-200 rpms. Driving me nuts. It does it with aftermarket throttle body and stock throttle body. IAC new, IAT new. Replaced vacuum lines. Can anyone comment to what I am missing? It's a noticeable surging that shouldn't be there.
Surging
- Thread starter 505
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A bad Throttle Position Sensor can cause this and rarely trips any codes. The wrong info gets passed from the TPS to the ECU and the ECU passes it to the Idle Air Motor.
If you decide to change it, remove and touch both battery cables together for a couple of seconds to purge any residual RAM from the ECU. Make sure it is the main Negative Battery Cable and not the shorter ground Cable.
If you wash your vehicle then lift the hood (if it is a stock hood) it likes to pee water directly onto the TPS. This is guaranteed to cause future issues as the TPS is a "cheap", mechanical variable resistor and doesn't play well with water.
Before you install a new TPS (if you do), you can smear some silicone sealant on it where it looks like water could get in and extend it's useful life a great deal.
If you have a multimeter, I can send you info on how to test yours but right now, I'm going for another coffee.
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Have you finished your coffee.. can you show a few pics of the locations and where the water gets in ?
On the off chance you meant where water could get into the TPS, see the (2) included pics. 
When my 5th or 6th one failed, I carefully opened it with a hammer to look inside and I could easily see water had found its way in.
The only place I can see it getting in would be the parting-line in the plastic (particularly the bottom of it). This pic is of one of four spares and hasn't been sealed yet, but the parting line is where I smear a bit of clear silicone on them.
The sealed one on the truck has been quietly doing its job now for 11 years without an issue.
The 2nd or 3rd one that failed would only pass 70% throttle opening to the ECU (NO CODES) when the Throttle Body was wide-open; and it just about drove me nuts trying to figure out why my truck was down 100 (?) horsepower...
After I installed a new one, it still didn't help until I did the battery-cable trick as the ECU was still working with the older, bad info from the failed TPS. Fried the poor Pirellis all the way through 2nd gear (insert smile here) after that.
When my 5th or 6th one failed, I carefully opened it with a hammer to look inside and I could easily see water had found its way in.
The only place I can see it getting in would be the parting-line in the plastic (particularly the bottom of it). This pic is of one of four spares and hasn't been sealed yet, but the parting line is where I smear a bit of clear silicone on them.
The sealed one on the truck has been quietly doing its job now for 11 years without an issue.
The 2nd or 3rd one that failed would only pass 70% throttle opening to the ECU (NO CODES) when the Throttle Body was wide-open; and it just about drove me nuts trying to figure out why my truck was down 100 (?) horsepower...
After I installed a new one, it still didn't help until I did the battery-cable trick as the ECU was still working with the older, bad info from the failed TPS. Fried the poor Pirellis all the way through 2nd gear (insert smile here) after that.
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Uhhh ohhh! Another hole post!I'm not sure why you'd ask, but here is a picture of the top hole of my coffee pot where the water gets in...
That thing needs some NEVR DULL hahahaha!
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That works!! Or just don't open hood when it's rainingOn the off chance you meant where water could get into the TPS, see the (2) included pics.
When my 5th or 6th one failed, I carefully opened it with a hammer to look inside and I could easily see water had found its way in.
The only place I can see it getting in would be the parting-line in the plastic (particularly the bottom of it). This pic is of one of four spares and hasn't been sealed yet, but the parting line is where I smear a bit of clear silicone on them.
The sealed one on the truck has been quietly doing its job now for 11 years without an issue.
The 2nd or 3rd one that failed would only pass 70% throttle opening to the ECU (NO CODES) when the Throttle Body was wide-open; and it just about drove me nuts trying to figure out why my truck was down 100 (?) horsepower...
After I installed a new one, it still didn't help until I did the battery-cable trick as the ECU was still working with the older, bad info from the failed TPS. Fried the poor Pirellis all the way through 2nd gear (insert smile here) after that.
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Hope this is all that's wrong with 505's surge issue
No, it has to be kept dirty for that "full-bodied" coffee experience.
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I getcha! There are times dirty holes are the winner! Lol
Good info to know … thanks RonnieOn the off chance you meant where water could get into the TPS, see the (2) included pics.
When my 5th or 6th one failed, I carefully opened it with a hammer to look inside and I could easily see water had found its way in.
The only place I can see it getting in would be the parting-line in the plastic (particularly the bottom of it). This pic is of one of four spares and hasn't been sealed yet, but the parting line is where I smear a bit of clear silicone on them.
The sealed one on the truck has been quietly doing its job now for 11 years without an issue.
The 2nd or 3rd one that failed would only pass 70% throttle opening to the ECU (NO CODES) when the Throttle Body was wide-open; and it just about drove me nuts trying to figure out why my truck was down 100 (?) horsepower...
After I installed a new one, it still didn't help until I did the battery-cable trick as the ECU was still working with the older, bad info from the failed TPS. Fried the poor Pirellis all the way through 2nd gear (insert smile here) after that.
Or washing it ! Then se the silicone type condom to prevent leakageThat works!! Or just don't open hood when it's raining
I get a slight surge but believe it’s from old gas after sitting in the tank for a long time … filled the tank and need to continue blowing it out ,, WOT WOT WOT LOL!
With cream and sugar loaded … I hate coffee
guys I cannot even begin to tell you how awful the Facebook SRT10 pages are. Just horrific. jackasses molesting what's left of these trucks. I had to get off of there. Anyway glad this forum is still going...back to point - my TPS and IAC are brand new. Ronnie I would be up for testing mine with a multimeter. I drive it at least once a week and run a tank through it every month. So I think the gas is OK.
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