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cwayne · 03-19-2009, 12:09 AM

Fellows, I have a 1989 Mitsubishi Mighty Max pick up truck with a 2.0 liter engine straight drive. Current engine has 170,000 miles. (Second engine.. first one died at 100,000)
About a month or so past it suddenly started backfiring and the engine would die. I thought I was not going to get it back to the house but I did. Things went fine after that so I thought perhaps I had some water in the tank. Well the problem has returned. I drained some gas from the tank, no water. I replaced the distributor cap, rotor button, spark plug wires, and fuel filter. The engine cranks fine, runs fine until about 45 or 50 mph and even might do so for awhile and then suddenly the engine starts to die and backfire. Well...I got it back home again. I checked the catalytic converter ... Ok .. can see daylight thru it. I even drove the vehicle with no exhaust system. Still have the problem. I have used my vacuum pump to check the EGR, the vacuum advance on the distributor and any thing else I could check. Found only a few poor vacuum lines. Fixed those. The truck has a new timing belt. My buddy told me to spark the economy and buy a new truck but I told him they come with payments, taxes, insurance, interest, Etc. So does anyone think perhaps the distributor or possibly the fuel pump could be the problem. I have not done a pressure test on the fuel pump. I can see fuel in the clear filter but am not real certain about the flow volume? Heres hoping someone has had this problem and can offer some input? My Thanks, CWayne

chevyiron420 · 03-19-2009, 03:01 AM

sounds like its running out of fuel. clogged filter, or intank screen, pump going south?

Bowtieman31 · 03-19-2009, 03:47 AM

It could also be something as simple as the fuel cap vent not working properly.

Troy · 03-19-2009, 02:58 PM

CWanye,

Probably not the problem but on my mini-van every once in a while a piece of carbon would break loose and lodge the EGR valve open. I would have to take it off and remove the carbon then it would run great again. This same van had a problem with the Ignition module and intermittingly would miss and some times just flat stall and wouldn't restart then after cooling down it would work again for months. Just some ideas, Hope you figure it out.

wrenchbend1 · 03-19-2009, 06:41 PM

Heres a long shot, but check your GROUNDS ! that strap from the block to the frame, check the computer grounds at the harness grounds . some time they go bad and man do all kindza crazy stuff . give it a shot what have you got to lose ? you put an engine in before, you must have an idea of where they are !
try it !!!
regards
Dave

Will · 03-19-2009, 08:55 PM

Sounds fuel related to me. Could be the fuel pump as you stated or something as simple as your gas cap not being tight, vented or shot. ???

cwayne · 03-19-2009, 09:52 PM

I thank all you for the input!! I am going to do a fuel pump flow and pressure test. I am not certain what ethanol does to some parts but my truck is 20 years old and I have read ethanol can ruin certain fuel pumps, some seals, float in the gas tank??
I now refrain from buying ethanol (does nothing for gas milage) and I really do not want it in my 57. Shell is thus far the only station I have found ethanol free. CWayne

cwayne · 03-21-2009, 09:32 PM

Fellows, I pulled the fuel line loose at the output of the fuel pump and very little fuel was flowing while turning the engine. Hooked up my fuel pressure gauge and less than one pound of pressure. Got a new pump and some new fuel hose. Got dark before I could complete everything so tomorrow I will find out. CWayne

Will · 03-21-2009, 10:29 PM

Quote:

Originally Posted by cwayne

Fellows, I pulled the fuel line loose at the output of the fuel pump and very little fuel was flowing while turning the engine. Hooked up my fuel pressure gauge and less than one pound of pressure. Got a new pump and some new fuel hose. Got dark before I could complete everything so tomorrow I will find out. CWayne

Good deal! Sounds like you found your problem.

57BUDDii · 03-21-2009, 10:48 PM

CWayne,

Keep us informed how this turns out.......we all need wheels and especially if it is a work truck.

BUDDii

03-19-2009, 12:09 AM	#1
cwayne Senior Member Join Date: May 2007 cwayne's Garage Posts: 156 Member #2798	My work truck Fellows, I have a 1989 Mitsubishi Mighty Max pick up truck with a 2.0 liter engine straight drive. Current engine has 170,000 miles. (Second engine.. first one died at 100,000) About a month or so past it suddenly started backfiring and the engine would die. I thought I was not going to get it back to the house but I did. Things went fine after that so I thought perhaps I had some water in the tank. Well the problem has returned. I drained some gas from the tank, no water. I replaced the distributor cap, rotor button, spark plug wires, and fuel filter. The engine cranks fine, runs fine until about 45 or 50 mph and even might do so for awhile and then suddenly the engine starts to die and backfire. Well...I got it back home again. I checked the catalytic converter ... Ok .. can see daylight thru it. I even drove the vehicle with no exhaust system. Still have the problem. I have used my vacuum pump to check the EGR, the vacuum advance on the distributor and any thing else I could check. Found only a few poor vacuum lines. Fixed those. The truck has a new timing belt. My buddy told me to spark the economy and buy a new truck but I told him they come with payments, taxes, insurance, interest, Etc. So does anyone think perhaps the distributor or possibly the fuel pump could be the problem. I have not done a pressure test on the fuel pump. I can see fuel in the clear filter but am not real certain about the flow volume? Heres hoping someone has had this problem and can offer some input? My Thanks, CWayne

03-19-2009, 03:01 AM	#2
chevyiron420 Senior Member 1 Silver Star Join Date: Jan 2007 chevyiron420's Garage Location: Barney Georgia Posts: 582 Member #1767	sounds like its running out of fuel. clogged filter, or intank screen, pump going south? __________________ Phil 1957 210 Sedan, 1956 210 Sedan

03-19-2009, 02:58 PM	#4
Troy Senior Member 1 Silver Star Join Date: Oct 2007 Troy's Garage Location: Antioch ca. Posts: 950 Member #3938	CWanye, Probably not the problem but on my mini-van every once in a while a piece of carbon would break loose and lodge the EGR valve open. I would have to take it off and remove the carbon then it would run great again. This same van had a problem with the Ignition module and intermittingly would miss and some times just flat stall and wouldn't restart then after cooling down it would work again for months. Just some ideas, Hope you figure it out. __________________ Take Care Troy

03-19-2009, 06:41 PM	#5
wrenchbend1 Senior Member 1 Blue Star Join Date: Jun 2008 wrenchbend1's Garage Location: New York Posts: 346 Member #5658	taking a stab at it Heres a long shot, but check your GROUNDS ! that strap from the block to the frame, check the computer grounds at the harness grounds . some time they go bad and man do all kindza crazy stuff . give it a shot what have you got to lose ? you put an engine in before, you must have an idea of where they are ! try it !!! regards Dave __________________ I want to die in my sleep like my dear old grandad and not kicking and screaming like all his passengers. Dave

03-19-2009, 08:55 PM	#6
Will Trifive Leaders Club Join Date: Oct 2008 Will's Garage Location: Nebraska Posts: 5,808 Member #6794	Sounds fuel related to me. Could be the fuel pump as you stated or something as simple as your gas cap not being tight, vented or shot. ??? __________________ 55 210 Delray Club Coupe 57 Belair 2dr HT - under construction

03-19-2009, 03:47 AM	#3
Bowtieman31 Senior Member Join Date: Aug 2008 Bowtieman31's Garage Location: Galt California Posts: 227 Member #6234	It could also be something as simple as the fuel cap vent not working properly.

03-19-2009, 09:52 PM	#7
cwayne Senior Member Join Date: May 2007 cwayne's Garage Posts: 156 Member #2798	Possible Fuel Pump I thank all you for the input!! I am going to do a fuel pump flow and pressure test. I am not certain what ethanol does to some parts but my truck is 20 years old and I have read ethanol can ruin certain fuel pumps, some seals, float in the gas tank?? I now refrain from buying ethanol (does nothing for gas milage) and I really do not want it in my 57. Shell is thus far the only station I have found ethanol free. CWayne

03-21-2009, 09:32 PM	#8
cwayne Senior Member Join Date: May 2007 cwayne's Garage Posts: 156 Member #2798	May Just Be The Problem ... Update Fellows, I pulled the fuel line loose at the output of the fuel pump and very little fuel was flowing while turning the engine. Hooked up my fuel pressure gauge and less than one pound of pressure. Got a new pump and some new fuel hose. Got dark before I could complete everything so tomorrow I will find out. CWayne

03-21-2009, 10:48 PM	#10
57BUDDii Senior Member 1 Silver Star Chat Room Moderator Extreme Snowboarding Champion! Clay Kitten Shooting II Champion! Join Date: Oct 2008 57BUDDii's Garage Location: Colorado Springs, Colorado Posts: 1,395 Member #6670	CWayne, Keep us informed how this turns out.......we all need wheels and especially if it is a work truck. BUDDii __________________ BUDDii _________ ______ ____ Can you help solve the 57 Mystery by decoding my Trim Code "Trim: "2226XC..............B"? Appears to have no back seat, "4dr Utility Sedan?" vinyl on rear wheel humps & no upper back seat retainers. click for larger image Style: 57 - 1219 Body No: K 4460 Trim: "2226XC..............B" Paint: ACC.:

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