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Old 08-11-2019, 10:29 PM #1
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Stumble on cold starts, then clears up.

Hey guys .

I’m getting a really bad studder when cold starting . For the first 10-15 seconds ,my truck has that “low rpm vibration” feel,where it almost feels like it’s gunna stall. I also notice that when I shut the truck off,it literally “kills itself” rather than the little 1 second lag of everything turning off (I hope it makes sense).

Sometimes ,when driving & letting off the throttle ,the RPM’s will dip low below 1000RPM,then jump back up to normal value . Any ideas ? No check engine light ,& after 15 or so secondary it’s back to normal(Minus the short drop to a low RPM then back up to normal).

Spark plugs changed about 15k miles ago. Cleaned MAF & TB. Haven’t changed out fuel filter . I want to do a fuel pressure test to see if it’s related . One thing I do notice is,when filling up gas,it’s difficult to get the pump to stay on. It’s always shutting off & I have to play with the trigger the whole time . I read that the charcoal canister might be clogged so I plan on trying to air that out. Would this cause any issues I’m having?

Thanks in advance
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Old 08-11-2019, 10:45 PM #2
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I forgot to mention . 2006 v6 4.0 4wd
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Old 08-12-2019, 10:38 AM #3
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Bump?
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Old 08-12-2019, 10:54 AM #4
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Off hand most people have started such problems with changing plugs, cleaning MAF sensor and cleaning throttle body. could also check vacuum hoses.
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Old 08-12-2019, 11:04 AM #5
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I hate to be the one to suggest this, but you do have an '06 - read some of the head gasket threads and see if you suffer any of those symptoms.
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Old 08-12-2019, 12:07 PM #6
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I wrote this ysterday,

MAF Mass Air Flow cold idle hiccup, bad but not failed ??

You could test the charcoal canister by unplugging the hose from the canister
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Old 08-13-2019, 11:35 AM #7
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Have you disconnected your battery recently? For probably 50 miles after disconnecting mine, my 4Runner has a really hard time idling. It eventually re-learns, but it definitely takes a bit.

Depending on your build date, you should be fairly safe from headgasket issues. Those were solved (to the best of my knowledge) mid-2005 model year by a headgasket redesign. I have a headgasket leak right now, and it's not fun (shop will be fixing it next week and it's gonna run me around $2k. Which is cheap from what I'm hearing). If your check engine light and VSC/TRAC lights start coming on during the rough idle, beware.
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Old 08-13-2019, 12:44 PM #8
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Quote:
Originally Posted by kcdehart View Post
Have you disconnected your battery recently? For probably 50 miles after disconnecting mine, my 4Runner has a really hard time idling. It eventually re-learns, but it definitely takes a bit.

Depending on your build date, you should be fairly safe from headgasket issues. Those were solved (to the best of my knowledge) mid-2005 model year by a headgasket redesign. I have a headgasket leak right now, and it's not fun (shop will be fixing it next week and it's gonna run me around $2k. Which is cheap from what I'm hearing). If your check engine light and VSC/TRAC lights start coming on during the rough idle, beware.

Battery hasn’t been disconnected prior to idle issue. I did disconnect to reset the ecu & still having issue. Hopefully not headgasket. No CEL . Were you throwing a cel ? What other symptoms were you having for the hg?
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Old 08-13-2019, 12:45 PM #9
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Quote:
Originally Posted by Seasparrow View Post
I wrote this ysterday,

MAF Mass Air Flow cold idle hiccup, bad but not failed ??

You could test the charcoal canister by unplugging the hose from the canister
Hey.

If I unplug the canister from the hose ,what’s the truck supposed to do? Or am I supposed to do any maintinence ? I read to blow air into one side of the canister,but to make sure it’s the correct side because there’s a one way valve in there ? I’m not sure how the canister works .


Please more unfocusing would help. Thanks for your help!
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Old 08-13-2019, 01:07 PM #10
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Battery hasn’t been disconnected prior to idle issue. I did disconnect to reset the ecu & still having issue. Hopefully not headgasket. No CEL . Were you throwing a cel ? What other symptoms were you having for the hg?
I believe it has to misfire for a certain period of time for it to throw a CEL. I've noticed that if I rev the engine to ~2,000RPM while it's stumbling, the misses clear fast enough that no CEL is thrown. Sometimes if I don't rev it's fine and starts normally. The rest of the time, it will stumble for 10-15 seconds pretty badly, throw the CEL and VSC/TRAC and then it'll drive perfectly once it's cleared all the coolant out of the cylinder (cylinder 4 in my case).

The only other symptoms I have are slow coolant loss and a wiff of burnt coolant when I start the truck. No smoke at all and no overheating (because I keep the coolant topped off. It would overheat if I just let it burn it all out).
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Old 08-13-2019, 06:27 PM #11
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Quote:
Originally Posted by kcdehart View Post
Have you disconnected your battery recently? For probably 50 miles after disconnecting mine, my 4Runner has a really hard time idling. It eventually re-learns, but it definitely takes a bit.

Depending on your build date, you should be fairly safe from headgasket issues. Those were solved (to the best of my knowledge) mid-2005 model year by a headgasket redesign. I have a headgasket leak right now, and it's not fun (shop will be fixing it next week and it's gonna run me around $2k. Which is cheap from what I'm hearing). If your check engine light and VSC/TRAC lights start coming on during the rough idle, beware.
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Battery hasn’t been disconnected prior to idle issue. I did disconnect to reset the ecu & still having issue. Hopefully not headgasket. No CEL . Were you throwing a cel ? What other symptoms were you having for the hg?
What's the build date on the VIN sticker on the driver's door jamb?
If 12/05 or later you should be fine concerning the head gasket issues, from 12/05 and onward the head gaskets were of the new design.
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Old 09-09-2022, 12:26 PM #12
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Quote:
Originally Posted by kcdehart View Post
Have you disconnected your battery recently? For probably 50 miles after disconnecting mine, my 4Runner has a really hard time idling. It eventually re-learns, but it definitely takes a bit.

Depending on your build date, you should be fairly safe from headgasket issues. Those were solved (to the best of my knowledge) mid-2005 model year by a headgasket redesign. I have a headgasket leak right now, and it's not fun (shop will be fixing it next week and it's gonna run me around $2k. Which is cheap from what I'm hearing). If your check engine light and VSC/TRAC lights start coming on during the rough idle, beware.
Uh oh.... did your headgasket issue cause those symptoms?
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Old 09-10-2022, 03:18 PM #13
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Uh oh.... did your headgasket issue cause those symptoms?
It caused stumbling/hard idle for the first minute or so, but that went away after a while. Eventually the exhaust gasses leaking out were just spewing coolant out of my reservoir on long drives. I think it leaked for at least the 40k that I drove it before replacement. So it can definitely be sat on for a while.

It ended up costing me $3k for the HG and another $3k for all timing components and the oil pump.
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Old 09-11-2022, 11:25 PM #14
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You need to get the vehicle nice and hot. Let sit, overnight is best, pull spark plugs on driver side and get a borescope down in the cylinders so you can see the coolant leaking in the cylinder
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