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1991 Montero RS does not stay running #1104587 10/06/18 11:38 PM
Joined: Aug 2018
Posts: 8
F
franknspeed Offline OP
Need a Spot
Was diagnosed as bad MAF. Finally found a used one but the same happens. Truck runs for a couple of minutes and then dies. Already has new fuel pump , coil wires and plugs. Head gasket and timing belt replaced. Heads rebuild. I’m running out of options. Almost think that it is starving for gas, but not sure fuel filter also fresh
Any suggestions?

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Re: 1991 Montero RS does not stay running [Re: franknspeed] #1104588 10/07/18 10:19 AM
Joined: Dec 2006
Posts: 161
cheesegrater Offline
Wheeler
If you think it's a fuel delivery issue, you can drizzle some gas into the carburetor when it stumbles to be sure.

Last edited by cheesegrater; 10/07/18 10:20 AM.
Re: 1991 Montero RS does not stay running [Re: franknspeed] #1104589 10/07/18 03:08 PM
Joined: Feb 2001
Posts: 2,323
MarkG Offline
Body Damage is Cool
*****
Are there any codes?


Mitsu # 6 - 98 6G72 Montero Sport, R D Lock, 31x10.5

Mitsu # 7 - 02 6G74 Montero Limited
Re: 1991 Montero RS does not stay running [Re: franknspeed] #1104590 10/07/18 08:07 PM
Joined: Aug 2018
Posts: 8
F
franknspeed Offline OP
Need a Spot
No current codes. When it’s over 75F the O2 sensor code comes on. Now that it is cooler that doesn’t happen anymore. Been like this for over 2 years.
The engine runs fine for a couple of minutes and then starts to sputter and dies. You can hear the fuelpump running, so that should no be the issue

Re: 1991 Montero RS does not stay running [Re: franknspeed] #1104591 10/07/18 08:07 PM
Joined: Aug 2018
Posts: 8
F
franknspeed Offline OP
Need a Spot
Water in the gas maybe? Sea foam treatment worth trying?

Re: 1991 Montero RS does not stay running [Re: franknspeed] #1104592 10/08/18 01:47 AM
Joined: Nov 2013
Posts: 89
G
GrantCee Offline
Getting the Wheeling Fever
Are you by any chance running a K&N filter?


1987 Montero SWB, 2.6L, 5spd
Weber conversion
2-valve head from Engine Machine Service
"4G54 FTW!"
Re: 1991 Montero RS does not stay running [Re: franknspeed] #1104593 10/09/18 02:35 PM
Joined: Aug 2018
Posts: 8
F
franknspeed Offline OP
Need a Spot
Stock intake setup with stock filter.
Is it possible to mix the connections on the fuel filter and with that cause a problem?

Re: 1991 Montero RS does not stay running [Re: franknspeed] #1104594 10/09/18 06:48 PM
Joined: Nov 2013
Posts: 89
G
GrantCee Offline
Getting the Wheeling Fever
Have you replaced the injection pressure regulator?


1987 Montero SWB, 2.6L, 5spd
Weber conversion
2-valve head from Engine Machine Service
"4G54 FTW!"
Re: 1991 Montero RS does not stay running [Re: franknspeed] #1104603 10/12/18 03:27 PM
Joined: Aug 2018
Posts: 8
F
franknspeed Offline OP
Need a Spot
Not yet, I’ll try that next. Pretty soo. The whole truck is rebuilt...🙄

Re: 1991 Montero RS does not stay running [Re: franknspeed] #1104609 10/13/18 03:11 AM
Joined: Feb 2005
Posts: 7,264
rxinhed Offline
Trail Leader
*****
Do you have the right MAF? 89 and 90/91 are different. If the FI system (not carb, CG) is not building pressure due to a faulty regulator...could have this effect.

Lastly, what about the troubleshooting section in the FSM?


1988 Mighty Max turbo 2.6 service body
1980 Power Wagon W400
Out of the parts business now, unless you visit Montero Ranch
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