NC Tom Posted November 21, 2022 Share Posted November 21, 2022 I know there are many, many posts about stalling and many, many posts about high idling. If these issues occur at the same time, does that help with the diagnosis? (88 4.0 Pioneer Auto, Renix) I have been dealing with an intermittent high idle on startup for some time. Only at startup and mostly on warmer days. Opening and dropping the hood seems to correct the idle. I know, VERY technical solution. Recently, it stalled while sitting at a light. (First time stalling, BTW) Started again, ran a bit and stalled. I had some nice folks push me out of the way because it would not restart. After many attempts, it did start. Seems like it may stall while sitting at a light, pressing the brake, but no stall if just idling in Park. My work around has been to shift into Neutral if I have to sit for awhile, then back to Drive. I have already done the ground refreshing stuff to no avail. Again, does experiencing both the conditions mean something specific? Link to comment Share on other sites More sharing options...
Pete M Posted November 21, 2022 Share Posted November 21, 2022 check for vacuum leaks (especially intake manifold) and test all the sensors. the link in my sig should have the procedures. Link to comment Share on other sites More sharing options...
JMO413 Posted November 22, 2022 Share Posted November 22, 2022 http://www.lunghd.com/Tech_Articles/Engine/Basic_Sensors_Diagnostics.htm#:~:text=RENIX vehicles use a SEPARATE,(See bottom of page.) This has all the tests and values for the Renix era. How far have you made it through cruisers tips? Link to comment Share on other sites More sharing options...
Classy Comanche Posted December 2, 2022 Share Posted December 2, 2022 Oh I had high idle when in park with my truck! That sounds like your TPS is off. My money is on that or IAC. If your opening and dropping the hood and it "corrects" it then it may be jarring the sensor back to where it should be position wise. When I had the high idle issue I got impatient and upset and I just bought a new O2 sensor, air filter, IAC and TPS and had them all installed at once. Idles smooth as butter now. I can't confirm for sure but it sounds like you may be running very lean for it to stall Link to comment Share on other sites More sharing options...
NC Tom Posted December 3, 2022 Author Share Posted December 3, 2022 On 11/21/2022 at 7:41 PM, JMO413 said: http://www.lunghd.com/Tech_Articles/Engine/Basic_Sensors_Diagnostics.htm#:~:text=RENIX vehicles use a SEPARATE,(See bottom of page.) This has all the tests and values for the Renix era. How far have you made it through cruisers tips? I've done 1-5 so far. Link to comment Share on other sites More sharing options...
JMO413 Posted December 3, 2022 Share Posted December 3, 2022 I would do #6 and then #8. IMHO Link to comment Share on other sites More sharing options...
NC Tom Posted December 3, 2022 Author Share Posted December 3, 2022 4 hours ago, Classy Comanche said: Oh I had high idle when in park with my truck! That sounds like your TPS is off. My money is on that or IAC. If your opening and dropping the hood and it "corrects" it then it may be jarring the sensor back to where it should be position wise. When I had the high idle issue I got impatient and upset and I just bought a new O2 sensor, air filter, IAC and TPS and had them all installed at once. Idles smooth as butter now. I can't confirm for sure but it sounds like you may be running very lean for it to stall I haven't had a sec to troubleshoot. After Dec 6, I'm hoping to carve out some time. I don't have a garage, so that doesn't help. My latest symptom to add is an odd cranking pattern if I start and stop a lot. Yesterday's example: Stopped at Dollar General, shopped a bit, started no problem. Stopped at Lowes, shopped a bit, started no problem. Stopped for gas. Turned over about four times and then started turning VERY slow. Like it was freezing cold or something. I gave it a rest, tried again and it was fine. Stopped to pick up Chinese food. Turned many times before catching. It seems to not do well with a lot of restarting. Link to comment Share on other sites More sharing options...
Classy Comanche Posted December 3, 2022 Share Posted December 3, 2022 Yeah cruisers tips are a life saver. The guy that works on my truck is on here and uses them, and used them on my truck. If I may ask what are you idling around? When I first started having issues it was borderline screaming at me [I also had 2 vac hoses loose] then after that is went down dramatically BUT still had high cranks. It would rev about 1000-1100 then go back down. I would drive it. Totally fine then park it. Then it idles back up. And I should also note reverse would jerk...hard. So hard the truck would lurch backwards. Afterwards I had said fix. Doesn't do anything of that nature. Half the time you can't tell it's shifting unless your listening for engine pitch. Reverse you can feel when shifting back to it. But doesn't jerk and lurch. I also wonder if maybe your MAP is possibly off? Because the way I'm thinking about this is that if it was a vac hose it'd be screaming at you like mine was at me. Then again it could be a tiny pinhole leak. It's hard to say. These are just the things that come to mind. Maybe your butterfly valve is dirty causing it to stick open? Link to comment Share on other sites More sharing options...
cruiser54 Posted December 3, 2022 Share Posted December 3, 2022 What were the results of Tip 5? Link to comment Share on other sites More sharing options...
NC Tom Posted December 3, 2022 Author Share Posted December 3, 2022 16 minutes ago, cruiser54 said: What were the results of Tip 5? Crap! I'm a liar. Rechecked the tips list and I haven't done 5. Just 1-4. I guess that goes on my ever-growing list of troubleshooting. Link to comment Share on other sites More sharing options...
cruiser54 Posted December 3, 2022 Share Posted December 3, 2022 You are SO busted!! Tip 5 is a biggie. Link to comment Share on other sites More sharing options...
NC Tom Posted December 3, 2022 Author Share Posted December 3, 2022 28 minutes ago, cruiser54 said: You are SO busted!! Tip 5 is a biggie. Yes sir. Sorry sir. Link to comment Share on other sites More sharing options...
cruiser54 Posted December 3, 2022 Share Posted December 3, 2022 LOL. Link to comment Share on other sites More sharing options...
pizzaman09 Posted December 3, 2022 Share Posted December 3, 2022 Confirm all the header bolts to the head are are tight. Link to comment Share on other sites More sharing options...
NC Tom Posted January 2, 2023 Author Share Posted January 2, 2023 Thanks for all the suggestions. I am back at checking it out today since the weather is very nice! I did buy a stethoscope, but I don't know how to use it to find problems and I'm actually kind-of scared to be poking that probe around a running motor. LOL! Any directions on using it to find leaks and squeaks is welcome. Link to comment Share on other sites More sharing options...
Pete M Posted January 2, 2023 Share Posted January 2, 2023 the louder it is, the closer you are. generally speaking. Link to comment Share on other sites More sharing options...
NC Tom Posted January 2, 2023 Author Share Posted January 2, 2023 3 hours ago, Pete M said: the louder it is, the closer you are. generally speaking. That's what I figured, but thought there might be more to it. That means that while the engine was "chirping", the probe offered no help. Not yet, anyway. Link to comment Share on other sites More sharing options...
Pete M Posted January 2, 2023 Share Posted January 2, 2023 belt chirping? that might not show up with a stethoscope. another method is a 3' length of tube. put one end up to your ear and probe around with the other. don't let it touch anything though. Link to comment Share on other sites More sharing options...
NC Tom Posted January 2, 2023 Author Share Posted January 2, 2023 On 12/3/2022 at 7:55 AM, cruiser54 said: You are SO busted!! Tip 5 is a biggie. I did #5 today. I am not good at all with a multi meter and the one I have is a Harbor Freight special. If I did this right, I'm showing a just under 2 ohms and it's steady. Wiggling the harness has no effect. Image attached. Then I did #6 and it does seem to idle smoother. After reading #7 and #8 I decided they may be too technical to tackle today. I am definitely intimidated by electrical work. BTW, opening those dang wire looms in a major PITA!!! Also checked the throttle body and it looks really clean. Didn't need much cleaning. No sticking when moved manually. My occasional high idle must be something else. Link to comment Share on other sites More sharing options...
NC Tom Posted January 2, 2023 Author Share Posted January 2, 2023 20 minutes ago, Pete M said: belt chirping? that might not show up with a stethoscope. another method is a 3' length of tube. put one end up to your ear and probe around with the other. don't let it touch anything though. Don't know if it's a belt. Only really happens when it's cold outside and definitely when it's cold and wet. It was suggested that I check the harmonic balancer. That's why I bought the scope. However, I'm not clear on how to check it with the engine running. Link to comment Share on other sites More sharing options...
cruiser54 Posted January 2, 2023 Share Posted January 2, 2023 LOOK at the balancer. Link to comment Share on other sites More sharing options...
NC Tom Posted January 2, 2023 Author Share Posted January 2, 2023 1 minute ago, cruiser54 said: LOOK at the balancer. I watched it for a long time today. Didn't notice anything as bad as that image. Very, very slight wobble, didn't really look off. Link to comment Share on other sites More sharing options...
cruiser54 Posted January 2, 2023 Share Posted January 2, 2023 spray the belt with some water and see what happens to the noise. Link to comment Share on other sites More sharing options...
Ωhm Posted January 3, 2023 Share Posted January 3, 2023 2 hours ago, NC Tom said: I did #5 today. I am not good at all with a multi meter and the one I have is a Harbor Freight special. If I did this right, I'm showing a just under 2 ohms and it's steady. Wiggling the harness has no effect. Image attached. Then I did #6 and it does seem to idle smoother. After reading #7 and #8 I decided they may be too technical to tackle today. I am definitely intimidated by electrical work. BTW, opening those dang wire looms in a major PITA!!! Also checked the throttle body and it looks really clean. Didn't need much cleaning. No sticking when moved manually. My occasional high idle must be something else. Multimeter set for Rx100Ω. Reading shows ≈200Ω's. Set meter to Rx1Ω. Ohm readings need good batteries in the multimeter. Check them. Link to comment Share on other sites More sharing options...
gogmorgo Posted January 3, 2023 Share Posted January 3, 2023 Harmonic balancer doesn't even need to be that bad to cause a squeak. I had one that took a while to track down, intermittent chirping. I put a new belt on it with no effect, cranked the snot out of it, that did nothing. Turned out to be a bad harmonic balancer, it had just enough wobble that the belt was slapping the timing cover, slowly sawing through it. Didn't even look like the rubber was coming out like the above. Link to comment Share on other sites More sharing options...
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