Well truck is stalling again

91stranger · May 2, 2018

Well after thinking I had it fixed it has started again. I replaced the ECT sensor and sender and my truck seemed like normal so I thought I had this issue fixed. Truck actually drove for a few weeks without issues or any signs of issues. Then yesterday leaving work it stalled at the end of my works parking lot. started after a few minutes then stalled again a few miles up the road when slowing down for the stop sign. after about 10 minutes it started back up and it then stalled again when I stopped at the store next to my house. later that night I started it to do some testing and it stalled and wouldn't start back up. so I called Napa and got them to reorder another engine coolant temp sensor bc I think theirs may be bad. I've had issues with their parts in the past. My plan is to replace that as well as the IAC and the ignition coil. anyone have any other ideas? My luck just will not change......

Craig0320 · May 2, 2018

91stranger said:
Well after thinking I had it fixed it has started again. I replaced the ECT sensor and sender and my truck seemed like normal so I thought I had this issue fixed. Truck actually drove for a few weeks without issues or any signs of issues. Then yesterday leaving work it stalled at the end of my works parking lot. started after a few minutes then stalled again a few miles up the road when slowing down for the stop sign. after about 10 minutes it started back up and it then stalled again when I stopped at the store next to my house. later that night I started it to do some testing and it stalled and wouldn't start back up. so I called Napa and got them to reorder another engine coolant temp sensor bc I think theirs may be bad. I've had issues with their parts in the past. My plan is to replace that as well as the IAC and the ignition coil. anyone have any other ideas? My luck just will not change......

I replaced my pcv valve because of high idle symptoms with napa parts. A month later I had the same symptoms. Bought a oem pcv valve on internet and have not had a problem since. Remember just because it is new does not mean it will last no days. I have never seen a Iac stall a truck. It will either not idle when stopped or idle/hang high rpms. Did you listen for the fuel pump running like last time?

Denisefwd93 · May 2, 2018

I may not know much.. but a temp sensor stalls the engine? I'm having temp problems on mine (not warming up) but it still runs. but has gone into limp mode.

Craig0320 · May 2, 2018

Denisefwd93 said:
I may not know much.. but a temp sensor stalls the engine? I'm having temp problems on mine (not warming up) but it still runs. but has gone into limp mode.

Yes a temp sensor does stall the truck by flooding it. Mine did the same thing. I have never seen a idle air control stall our trucks running down the road.

rusty ol ranger · May 2, 2018

An IAC only function is to keep it idleing.

It will not make the truck stall once the throttle is on.

91stranger · May 4, 2018

rusty ol ranger said:
An IAC only function is to keep it idleing.

It will not make the truck stall once the throttle is on.

It only stalls when truck goes to idle. Like when I let off the gas to brake for a stop or just letting off the gas in general. I had to get home by driving with overdrive off and sometime in second gear to keep the rpms up. I did notice that on my way from my work to Napa that my coolant was extremely hot. This is only a 3 minute drive through the city. Probably only a mile if that. Truck was cold (cooler at least) because it hadn't run since 6 hours before hand. So I was going to change the thermostat at the same time but didn't have a 6 point 10mm on me. Got home (after stalling 5 times) and changed the thermostat and it seems better. truck drove to work today but it has never stalled in the mornings. only after work when its warmer out. So what I'm getting at is could a bad t stat be the culprit? It was pretty ugly and the jiggler wasn't working like the new one.

Craig0320 · May 4, 2018

91stranger said:
It only stalls when truck goes to idle. Like when I let off the gas to brake for a stop or just letting off the gas in general.

Did you ever replace the iac? If it starts right back up after it stalls then that sounds like an iac problem. Once the engine warms up and the computer is out of warm up mode it will drop the idle. If the iac is faulty and telling the computer it is closed and it is 40% open then the computer will compensate and idle the engine lower. This may be causing the stalling at idle. If you had a vacuum leak normally it will cause a high idle.

91stranger · May 5, 2018

I have an IAC on order which should be here in a few days and an ignition coil on order. I've been cleaning the IAC with brake cleaner and stuff. I replaced the thermostat and truck has not stalled yet. knock on wood. it has never stalled on my way to work since its still chilly out. only had stalling issues when it was warmer out. Motor and coolant would be hot as hell after a couple minutes. Gauge would read normal. I replace both the temp sensor and the temp sender so those should be fine. Could a bad thermostat do this?

Craig0320 · May 5, 2018

91stranger said:
I have an IAC on order which should be here in a few days and an ignition coil on order. I've been cleaning the IAC with brake cleaner and stuff. I replaced the thermostat and truck has not stalled yet. knock on wood. it has never stalled on my way to work since its still chilly out. only had stalling issues when it was warmer out. Motor and coolant would be hot as hell after a couple minutes. Gauge would read normal. I replace both the temp sensor and the temp sender so those should be fine. Could a bad thermostat do this?

My moms 99 3.0 thermostat was stuck open and it stayed on c and never moved. No ill effects from it other than heater being warm. I have never seen a thermostat stall an engine and really do not think it ever would IMO. Sometimes cleaning the iac never helps and buying a new one is just what you have to do. I would order a name brand iac because the cheap ones never idle right and do not last.

91stranger · May 10, 2018

So truck is still stalling. It only stalls in the heat of the day. Only code I have is a P0455 for a large leak on evap system. When I was stalled on the side of the road I was talking to a guy outside and said it could be fuel line vapor lock. He said his dodge was doing the same thing and he put a wooden clothespin on it and it has been fine ever since. Anyone know if this code would cause the truck to stall when warm? I need to get this fixed. This makes 17 times the truck has stalled on me in the past few weeks.

planeflyer21 · May 10, 2018

Vapor lock sure used to kill my '77 Dodge. As soon as it was over 90°F and I had lots of driving to do.

The issue with mine was the fuel line crossing the head to the carb. I could've fixed it with a plastic riser block between the carb and intake manifold, which would've lifted the fuel line enough to keep it clear of the heat.

Maybe you can find something similar.

Big'Un · May 10, 2018

Sounds like you need a new fuel filter....unless you've changed it recently.

Jerlaine · May 21, 2018

I've had a similar issue myself. Have replaced the IAC 3 times, the last 2 proving good on my explorer. It isn't my fuel filter because that's also new.

At this point pretty sure it's the fuel pressure regulator onine at this point as it acts like it's vapor locked when there's any heat outside

91stranger · May 21, 2018

Well I've narrowed it down to a wiring issue somewhere within the wiring for the #27 fuse. This is always blown and when I replace it, that is when I have stalling issues. So this fuse controls the o/d, trans shifting, reverse lights and probably a few other things. So I checked the common o/d wire in the shroud and it did have some slight chaffing but there wasn't any wires exposed. So I wrapped it in a fair amount of electrical tape for good measure. Next step is to go through in-line plug connectors and clean those while checking for wiring faults. I have drove my truck for 2 weeks without stalling but I know that if I put in a new fuse for the #27 that it will start stalling. Fuel filter will be replaced soon. I got to replace my filler neck first. That actually fell off the other day and I made a big splash when I went to put gas in lol.

Well truck is stalling again

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