User-Matt Posted May 19, 2018 Share Posted May 19, 2018 So I've been doing some trouble shooting with my high idle issue with a GL-10 turbo. From everything I've seen on the form it looks like the CTS is the culprit and do to time line I've already got it on order. So when looking at the thermostat there is only a 1 wire sensor at the bottom of that. The only 2 wire sensor I was able to locate is a third of the way down the rad on the passenger side. The connector looks to be the same as what I'm searching out. one of the wires is in series with the A/C fan though which tells me this is switch rather than a sensor. The only replacement vids I've been able to find are N/A models and have the two wire sensor under the thermostat which does not match what I'm looking at. Attached some photos of what I'm looking at. Quote Link to comment Share on other sites More sharing options...
DaveT Posted May 19, 2018 Share Posted May 19, 2018 The CTS cannot be on the radiator, that is something else, probably the fan sensor. I can only look at the diagram in my FSM. The CTS looks like it is on a coolant duct - cast aluminum thing - behind the intake manifold. On the thermostat side of the engine. Quote Link to comment Share on other sites More sharing options...
naru Posted May 20, 2018 Share Posted May 20, 2018 The CTS is not ypur high idle culprit. The ECU in turbo cars does not control idle speed according to coolant temperature like a SPFI car does. Have you:tried adjusting idle speed via the large brass idle speed adjustment screw in the throttle body? Quote Link to comment Share on other sites More sharing options...
john in KY Posted May 20, 2018 Share Posted May 20, 2018 Just from memory the CTS is located on that crossover pipe under the intake manifold right side of the throttle body. a real bear to get at. Quote Link to comment Share on other sites More sharing options...
jono Posted May 20, 2018 Share Posted May 20, 2018 Hotwire or flapper air flow meter? Both have a fast idle control device but differ from series one flapper to series two Hotwire High idle means it is getting more air bypassing throttle body butterfly Quote Link to comment Share on other sites More sharing options...
naru Posted May 20, 2018 Share Posted May 20, 2018 Hotwire or flapper air flow meter? Both have a fast idle control device but differ from series one flapper to series two Hotwire No they don`t. Both turbo engines use the same AAV(auxilary air valve) for high idle on a cold engine. No CTS involved. Quote Link to comment Share on other sites More sharing options...
skishop69 Posted May 20, 2018 Share Posted May 20, 2018 +1 You could also have an air leak between the MAF and the throttle body. I missed a line on the intake boot once and she idled right up to 2K. Quote Link to comment Share on other sites More sharing options...
Gloyale Posted May 20, 2018 Share Posted May 20, 2018 CTS is Bosch style 2 pin connector. No pigtail, harness clips straight to it. "natural" color. In front of turbo area, in the crossover pipe portion of intake. test if the idle issue is AAV related. Pinch the hose. If idle drops, then you're AAV is stuck open or leaking. I've just capped of a few of them. Then set the idle with the screw in the back of the throttle body. Might mean needing a tad bit of foot throttle on very cold days to warm up, but otherwise works fine and is less annoying than a constant high idle. Quote Link to comment Share on other sites More sharing options...
User-Matt Posted May 21, 2018 Author Share Posted May 21, 2018 Going to be tearing into it tonight to have a look at the suggestions you all listed. I'll report back once I have a look. Quote Link to comment Share on other sites More sharing options...
User-Matt Posted May 22, 2018 Author Share Posted May 22, 2018 Looks to be a combination issue. Found a few vacuum leaks that prompted me to replace all of the vacuum lines with new as they were all brittle and weren't sealing the best. Also looks like the previous owner took the cap off the AAV and didn't do a good job of resealing because it was apart and filled with junk. Cleaned it out but it was late last night so didn't start the car as the exhaust is not assembled so it's loud and i didn't want to wake my neighbors. So we'll see how she runs tonight. Quote Link to comment Share on other sites More sharing options...
User-Matt Posted May 24, 2018 Author Share Posted May 24, 2018 The AAV was already adjusted as far as it would go to lower idle so my guess is it's either leaking or seized. I'm going to follow Gloyale's advice and just clamp the hose and be done with it. Probably needs to be pretty cold for this to make for hard starts with the hose clamped. Thanks for the help all ! Quote Link to comment Share on other sites More sharing options...
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