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Stumble at startup #673273
12/03/05 04:43 PM
12/03/05 04:43 PM
F
FarmerTed  Offline OP
Getting the Wheeling Fever
Joined: Oct 2005
Posts: 65
Utah
About 50% of the time when the truck is cold, the engine will stumble for a second or two at startup. It then jumps right up to fast idle at about 1500 rpm. It never stalls and only does it about 1/2 of the time. Any ideas of what's causing this? I did a full tune up a month or so ago and it still does it. It runs great otherwise.
EDIT: When it's warm it starts up fine.

Last edited by FarmerTed; 12/03/05 05:50 PM.

1994 4x4 22RE
From the Off-Road World
Re: Stumble at startup [Re: FarmerTed] #673274
12/03/05 05:44 PM
12/03/05 05:44 PM
Frank Torres  Offline
Wheeler
Joined: Oct 2002
Posts: 153
Cedar Park, Texas
Have you cleaned the throttle body?
Those things can get very dirty over time.


1991 FJ 80 Land Cruiser for fun.
1998 GS300 for the wife
1998 GS400 for me
1991 Supra SOLD
1986 4Runner 335k miles-22re EB inside.SOLD
Re: Stumble at startup [Re: Frank Torres] #673275
12/03/05 05:49 PM
12/03/05 05:49 PM
F
FarmerTed  Offline OP
Getting the Wheeling Fever
Joined: Oct 2005
Posts: 65
Utah
Quote
Have you cleaned the throttle body?
Those things can get very dirty over time.

I did recently clean the TB. It wasen't very dirty though.


1994 4x4 22RE
Re: Stumble at startup [Re: FarmerTed] #673276
12/03/05 05:52 PM
12/03/05 05:52 PM
4Crawler  Offline
Web Wheeler
Joined: Jan 2000
Posts: 12,153
N. California. USA *****
You might try the fuel pump test jumper. Could be the fuel pump is sometimes not run when the starter is engaged and the stumble is due to the drop in residual fuel pressure before the pump can catch up.

Re: Stumble at startup [Re: FarmerTed] #673277
12/04/05 01:31 AM
12/04/05 01:31 AM
Esquire812  Offline
Trail Leader
Joined: Apr 2002
Posts: 5,688
Port Orchard, Washington
Keep an eye on your coolant level...if there is the slightest drop then gear up for a cylinder head removal. I've learned that the symptoms you describe have been a blown headgasket (2 occasions) and a bad head on another.

That stumble is one of the cylinders not firing, the stumble goes away and the engine resumes normal operation when the cylinder dries out.

Hows this happen when cold and not warm? Slow coolant leak, as the engine cools down the seepage is occuring...residual leakage is at first evaporated till the cylinder cools down enough...leak still occuring. As casting cools, crack seals and stops seeping coolant. You now have a wet cylinder. Wont happen on a warm engine because there isnt enough time for coolant to collect before refiring.

~Darin <img src="/forums/images/graemlins/baby.gif" alt="" />


88' 4x4 *22R-EB Gen II*
87' $Runner *22R-EB Gen I*
85' Sillyca 22R-Esq

"I LIVE IN MY OWN WORLD...THEY KNOW ME WELL THERE"
Re: Stumble at startup [Re: Esquire812] #673278
12/04/05 03:53 AM
12/04/05 03:53 AM
F
FarmerTed  Offline OP
Getting the Wheeling Fever
Joined: Oct 2005
Posts: 65
Utah
Doesn't seem to be using any coolant. The level has not changed in the 2 months I've owned it. And it was doing the stumble when I bought it. I'll pull the plugs in the morning and see if any of them are wet with coolant.


1994 4x4 22RE
Re: Stumble at startup [Re: FarmerTed] #673279
12/05/05 01:16 AM
12/05/05 01:16 AM
SHAD  Offline
Body Damage is Cool
Joined: Jun 2002
Posts: 1,698
South Burlington, VT
It sounds stupid but have you double checked the cap and rotor?
Mine had a mystery stumble happening. I tried alot of stuff valve adjustment checked compression it was all good.
It turns out when I put the new cap it wasn't aligned all the way and the rotor gouged all the points on the cap it also gouged part of the rotor off.
Pretty common issue the GP Soreson caps don't fit exactly like OEM so they have that issue.
I changed out te cap and rotor and made sure it was all straight when I put the new one on and now the stumble is gone.


86 Toyota 4 runner
35x12.5 BFG MT's, 4.56's XRC8 winch
My cardomain page
Re: Stumble at startup [Re: SHAD] #673280
12/05/05 04:29 AM
12/05/05 04:29 AM
F
FarmerTed  Offline OP
Getting the Wheeling Fever
Joined: Oct 2005
Posts: 65
Utah
I pulled the plugs this morning when the engine was cold. No signs of any coolant on them. All looked nice and clean. I changed the cap and rotor when I did a full tune up last month. The stumble was there before and after. It only does it half of the time and only for a second on start up when its cold. Any other ideas? Its not a big deal but I'd like to fix it.


1994 4x4 22RE
Re: Stumble at startup [Re: FarmerTed] #673281
12/05/05 04:39 AM
12/05/05 04:39 AM
4Crawler  Offline
Web Wheeler
Joined: Jan 2000
Posts: 12,153
N. California. USA *****
Have you tried the fuel pump test jumper?

Re: Stumble at startup [Re: FarmerTed] #673282
12/05/05 10:20 AM
12/05/05 10:20 AM
A
Anonymous
Unregistered

test fuel rail pressure

Page 1 of 2 1 2

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