Runs rough need help

Tiny
ROBERT1983
  • MEMBER
  • 1994 MITSUBISHI MIGHTY MAX
A few weeks ago truck would start jerking and felt like it wasnt getting any gas. Cut it off let it sit a day or two ran fine till did it again started it up one day and washed the engine while running with a bag over distributor. Left engine running went down road and when pedal was to the floor took forver to go over 45 mph. Same night cranked back up went to go down the road and it was like the truck was running out of gas and skipping bad. Popped hood and you could see blue arcs coming for distributor cap area.I replaced distributor cap rotor button plug wires and new plugs. Same issue is still occurring now you have to to get the truck to 45 mph for it to run half way decent, thats if you can get it warmed up enough. From here I followed everybodys advice and replace fuel filter, cleane egr valve, cleaned up throttle body, and the other night I saw the ignition coil arcing from the middle of it not the wire post so I replaced it to. I have the same issue can someone please help me im out of ideas
Thursday, March 8th, 2012 AT 12:57 AM

17 Replies

Tiny
TWO LANE
  • MECHANIC
  • 34 POSTS
Lets see what we can do. Is the check engine light on also I saw all the things you replaced and still doing the same thing. So it could be allot of different things when it is an power problem as you know you just have to try and eliminate things.I would start with checking your vacuum lines and make sure you don't have a leak. It is strange you keep seeing the spark jumping also would check all grounds to engine. The other thing is does it idle ok or is it seem like it is missing. I will look up your car and see if there is anything in Mitchell.
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Thursday, March 8th, 2012 AT 4:51 AM
Tiny
ROBERT1983
  • MEMBER
  • 9 POSTS
No the check engine light is not on. I just cranked it up a hour ago and its a warm day so it stayed idleing. When its cold it takes a while to get it warmed up enough to keep cranked. Yes it fells like its missing when you try to drive it you go faster by not pressing the gas pedal.
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Thursday, March 8th, 2012 AT 8:55 PM
Tiny
TWO LANE
  • MECHANIC
  • 34 POSTS
I just want to make sure I got it all, so it is hard to start and when it is running it has no power and runs rough.I will look up on Mitchell and see if there are any tsb, s for it. If you have access to a scanner you could check the sensors it sounds like it could poss be the idle air control or something with the fuel system seen how you have fix the ignition problems, also have you check the fuel pressure.I know it is hard if you don't have access to a scanner but that is the best way to see what the motor is doing.
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Saturday, March 10th, 2012 AT 7:36 AM
Tiny
ROBERT1983
  • MEMBER
  • 9 POSTS
It doesnt have a place to attach a tester. How can I check the tps and ips could it be the fuel regulator and how would I check that
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Thursday, March 15th, 2012 AT 12:25 AM
Tiny
TWO LANE
  • MECHANIC
  • 34 POSTS
I will send you the chart for testing let me load it in.
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Thursday, March 15th, 2012 AT 2:48 AM
Tiny
ROBERT1983
  • MEMBER
  • 9 POSTS
Will you be able to load it here or do you need my email
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Thursday, March 15th, 2012 AT 11:52 PM
Tiny
TWO LANE
  • MECHANIC
  • 34 POSTS
Send me your email tried to put it here but wont go thru
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Friday, March 16th, 2012 AT 12:02 AM
Tiny
ROBERT1983
  • MEMBER
  • 9 POSTS
Countrythug1983@aol. Com
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Friday, March 16th, 2012 AT 12:42 AM
Tiny
TWO LANE
  • MECHANIC
  • 34 POSTS
I am working on it trying to import it wont let me copy it so just give me a minute
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Friday, March 16th, 2012 AT 1:32 AM
Tiny
TWO LANE
  • MECHANIC
  • 34 POSTS
It wont let me copy the text so I will give it to you the best I can also here is pic of it hooked in make sure to check for leaks
1 Connect fuel pressure gauge with adaptor between fuel delivery pipe and high pressure hose.
2 Start engine and let idle. Measure fuel pressure with vacuum hose connected to fuel pressure regulator. Record fuel pressure readings
see if this helps

Fuel pump performance

application at idle w/vacuum (1) at idle w/o vacuum(2)
all models 38 47-50

(1) with vacuum at pressure regulator
(2) with vacuum at pressure regulator
Image (Click to make bigger)
Thumb
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Friday, March 16th, 2012 AT 2:19 AM
Tiny
ROBERT1983
  • MEMBER
  • 9 POSTS
I will try this but also how do I check the throttle pos sensor and idle pos sensor and how will I know if the comp is working right.
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Friday, March 16th, 2012 AT 11:50 PM
Tiny
TWO LANE
  • MECHANIC
  • 34 POSTS
The last reply did not go thru the best way to check the sensors is with a scanner if you don't have access you can use a multi meter to measure the sensors. What was you question with the comp.
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Tuesday, March 20th, 2012 AT 4:01 AM
Tiny
ROBERT1983
  • MEMBER
  • 9 POSTS
I finally were able to pull codes got 3 of them 1. Vehicle speed control sensor 2. Motor position sensor 3 TPS
thats the order they came in. My problem is the dealer says on his comp has nothing about the top 2 codes his comp shows no parts for that. Please help does it or doesnt it have a vechicle speed control sensor 94 mighty max 2wd 4cyl 2.0
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Wednesday, May 2nd, 2012 AT 9:26 PM
Tiny
TWO LANE
  • MECHANIC
  • 34 POSTS
I will check what is the code numbers
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Thursday, May 3rd, 2012 AT 9:10 PM
Tiny
ROBERT1983
  • MEMBER
  • 9 POSTS
10 15 14 I checked again today and now not getting any codes
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Friday, May 4th, 2012 AT 11:24 PM
Tiny
TWO LANE
  • MECHANIC
  • 34 POSTS
I will check them out
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Saturday, May 5th, 2012 AT 6:38 AM
Tiny
ROBERT1983
  • MEMBER
  • 9 POSTS
Find anything out yet
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Monday, May 14th, 2012 AT 1:20 AM

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