08-11-2019, 10:29 PM
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#1
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Join Date: Nov 2018
Location: Carson,Ca.
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Real Name: underscore
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Member
Join Date: Nov 2018
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Real Name: underscore
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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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08-11-2019, 10:45 PM
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#2
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Member
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Join Date: Nov 2018
Location: Carson,Ca.
Posts: 37
Real Name: underscore
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Member
Join Date: Nov 2018
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Real Name: underscore
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I forgot to mention . 2006 v6 4.0 4wd
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08-12-2019, 10:38 AM
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#3
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Member
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Join Date: Nov 2018
Location: Carson,Ca.
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Real Name: underscore
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Member
Join Date: Nov 2018
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Bump?
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08-12-2019, 10:54 AM
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#4
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Member
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Join Date: May 2018
Location: Swampy and Sunny
Posts: 212
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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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NATO Seasparrow Mk 57 Mod 2 & 3
2004 4th Gen Sport Edition
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08-12-2019, 11:04 AM
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#5
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Join Date: Feb 2019
Location: Texas
Posts: 500
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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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08-12-2019, 12:07 PM
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#6
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Join Date: May 2018
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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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NATO Seasparrow Mk 57 Mod 2 & 3
2004 4th Gen Sport Edition
Last edited by Seasparrow; 08-12-2019 at 12:12 PM.
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08-13-2019, 11:35 AM
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#7
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Join Date: Aug 2016
Location: Fredericksburg, VA
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Real Name: Kevin
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Member
Join Date: Aug 2016
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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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'04 4Runner - Build Thread | '05 CBR 600RR & 1000RR - The slow vehicles ;)
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08-13-2019, 12:44 PM
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#8
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Member
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Join Date: Nov 2018
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Real Name: underscore
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Member
Join Date: Nov 2018
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Quote:
Originally Posted by kcdehart
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?
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08-13-2019, 12:45 PM
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#9
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Member
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Join Date: Nov 2018
Location: Carson,Ca.
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Real Name: underscore
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Member
Join Date: Nov 2018
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Quote:
Originally Posted by Seasparrow
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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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08-13-2019, 01:07 PM
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#10
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Join Date: Aug 2016
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Real Name: Kevin
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Member
Join Date: Aug 2016
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Quote:
Originally Posted by underscorepatrick
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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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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'04 4Runner - Build Thread | '05 CBR 600RR & 1000RR - The slow vehicles ;)
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08-13-2019, 06:27 PM
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#11
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Senior Member
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Join Date: Nov 2016
Location: South Carolina
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Real Name: Skip
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Senior Member
Join Date: Nov 2016
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Quote:
Originally Posted by kcdehart
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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Quote:
Originally Posted by underscorepatrick
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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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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2004 Limited V8
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09-09-2022, 12:26 PM
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#12
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Junior Member
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Join Date: Jul 2022
Location: Sacramento, CA
Posts: 1
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Join Date: Jul 2022
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Quote:
Originally Posted by kcdehart
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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Uh oh.... did your headgasket issue cause those symptoms?
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09-10-2022, 03:18 PM
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#13
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Member
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Join Date: Aug 2016
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Member
Join Date: Aug 2016
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Quote:
Originally Posted by supergrappler
Uh oh.... did your headgasket issue cause those symptoms?
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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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'04 4Runner - Build Thread | '05 CBR 600RR & 1000RR - The slow vehicles ;)
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09-11-2022, 11:25 PM
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#14
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Join Date: Jan 2013
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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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