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90 Montero Seems starved for gas #1101525
06/16/16 06:12 AM
06/16/16 06:12 AM
D
Dartmouthbrian  Offline OP
Need a Spot
Joined: Oct 2014
Posts: 22
Seattle WA
Any ideas? Starts, but seems starved for gas, surges. Definitely not drivable.

Things done: Checked the throttle body, Checked the ECU, Tried a new ECU, New fuel pump...


Thoughts??


91 Montero RS
90 Montero base
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Re: 90 Montero Seems starved for gas [Re: Dartmouthbrian] #1101528
06/16/16 06:10 PM
06/16/16 06:10 PM
DJPASS7  Offline
Need a Spot
Joined: Nov 2015
Posts: 18
Chico, CA
Seems a lot like the infamous idle air control valve (IAC). Here is a link on how to clean it. http://www.4x4wire.com/mitsubishi/tech/throttle_body/


1989 Montero LS LWB
Rear LSD, KYB's, 3.0L, Lockup A/T, 2" BL, T-Bar Crank, 33" MTZ's, Full Length Roof Rack, 9k Winch with custom bumper, Rock Sliderz
Re: 90 Montero Seems starved for gas [Re: Dartmouthbrian] #1101531
06/16/16 08:10 PM
06/16/16 08:10 PM
D
Dartmouthbrian  Offline OP
Need a Spot
Joined: Oct 2014
Posts: 22
Seattle WA
Thanks DJPASS7. Definitely not the issue on mine. I should have been more clear on the throttle body piece I mentioned above. That has been done. Still no bueno.


91 Montero RS
90 Montero base
Re: 90 Montero Seems starved for gas [Re: Dartmouthbrian] #1101564
06/21/16 05:53 AM
06/21/16 05:53 AM
D
Dartmouthbrian  Offline OP
Need a Spot
Joined: Oct 2014
Posts: 22
Seattle WA
Man... I could sure use some advice. I have searched HIGH and low... On this forum, on other forums.. Even on other car forums.

Basically what I traced down to the MAF sensor (or so I thought). I was able to start the truck and keep it running if I had the MAF Sensor unplugged, but if I touched the gas she would dies. Got another MAF Sensor off a truck that had been running fine before being wrecked. Plugged in and the Montero started and ran, but same issue, touch the gas and it dies.

I have been through the TPS, IAC, ECU, MFI Relay, Fuel Pump, MAF Sensor, cleaned the throttle body... Im at my wits end here.

Any ideas??


91 Montero RS
90 Montero base
Re: 90 Montero Seems starved for gas [Re: Dartmouthbrian] #1101567
06/21/16 09:52 AM
06/21/16 09:52 AM
cheesegrater  Offline
Wheeler
Joined: Dec 2006
Posts: 142
Franklin IN
Have you checked for clogged fuel filter or injectors?

Last edited by cheesegrater; 06/21/16 09:53 AM.
Re: 90 Montero Seems starved for gas [Re: Dartmouthbrian] #1101568
06/21/16 10:21 AM
06/21/16 10:21 AM
P
pcc  Offline
Body Damage is Cool
Joined: Mar 2005
Posts: 1,006
South East U.S.A.
Can you very slowly depress the gas pedal and get it to rpm higher? Is the idle OK? I would have thought TPS as that's the sensor that tells the computer to give it a shot of gas when depressing gas pedal.

Maybe try using starter fluid to give it a shot as you open the throttle, see if that helps. If so I'd still look to TPS.


92 Montero LS 3.0L V6 Auto, Stock, Original owner, 185,800K miles
Re: 90 Montero Seems starved for gas [Re: Dartmouthbrian] #1101572
06/24/16 06:45 AM
06/24/16 06:45 AM
D
Dartmouthbrian  Offline OP
Need a Spot
Joined: Oct 2014
Posts: 22
Seattle WA
Cheesegrater: yes, actually changed the fuel filter too.

pcc: I'll try that. Thanks for the advice. Maybe I'll try another TPS.

I am going to check a few more things. I'll report back. This one is baffling. I'll make sure no matter what to document what I find in case someone else runs into this problem at some point.


91 Montero RS
90 Montero base
Re: 90 Montero Seems starved for gas [Re: Dartmouthbrian] #1101576
06/24/16 02:27 PM
06/24/16 02:27 PM
4x4Wire  Offline
Trail Leader
Joined: Feb 2000
Posts: 6,153
Lakeside, CA ***
Did you test fuel pressure? You said you replaced filter and pump. But, did you verify the pressure? Your surging can come from uneven fuel flow. And, fuel systems are pressurized to the point that a bad gas cap not sealing can cause performance issues.


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