What else can I check to get this car running again

Tiny
LOST
  • 1992 MITSUBISHI EXPO
  • 180,000 MILES

1992 Mitsubishi Expo will not start after replacing fuel pump

Do you
have the same problem?
Yes
No
Thursday, September 8th, 2011 AT 1:07 PM

15 Replies

Tiny
WRENCHTECH
  • EXPERT
  • 20,758 POSTS

All "crank, no start" conditions are approached in the same way. Every engine requires certain functions to be able to run. Some of these functions rely on specific components to work and some components are part of more than one function so it is important to see the whole picture to be able to conclude anything about what may have failed. Also, these functions can ONLY be tested during the failure. Any other time and they will simply test good because the problem isn't present at the moment.
If you approach this in any other way, you are merely guessing and that only serves to replace unnecessary parts and wastes money.

Every engine requires spark, fuel and compression to run. That's what we have to look for.

These are the basics that need to be tested and will give us the info required to isolate a cause.

1) Test for spark at the plug end of the wire using a spark tester. If none found, check for power supply on the + terminal of the coil with the key on.

2) Test for injector pulse using a small bulb called a noid light. If none found, check for power supply at one side of the injector with the key on.

3) Use a fuel pressure gauge to test for correct fuel pressure, also noticing if the pressure holds when key is shut off.

4) If all of these things check good, then you would need to do a complete compression test.

Once you have determined which of these functions has dropped out,
you will know which system is having the problem.

Was this
answer
helpful?
Yes
No
Thursday, September 8th, 2011 AT 1:26 PM
Tiny
KHLOW2008
  • EXPERT
  • 42,001 POSTS

Did you check the fuel pressure at the fuel rail?
Did you confirm the fuel pump is working when ignition is turned on or while cranking?

Was this
answer
helpful?
Yes
No
Thursday, September 8th, 2011 AT 1:31 PM
Tiny
LOST
  • MEMBER

I have spark but no injector pulse

Was this
answer
helpful?
Yes
No
Thursday, September 8th, 2011 AT 1:45 PM
Tiny
WRENCHTECH
  • EXPERT
  • 20,758 POSTS

Check to see if it is the power supply side or the pulsing ground side that you lost.
What is the fuel pressure.

Was this
answer
helpful?
Yes
No
Thursday, September 8th, 2011 AT 2:00 PM
Tiny
LOST
  • MEMBER

STAND BY-CHECKING

Was this
answer
helpful?
Yes
No
Thursday, September 8th, 2011 AT 2:15 PM
Tiny
LOST
  • MEMBER

OK IT IS THE GROUND SIDE

Was this
answer
helpful?
Yes
No
Thursday, September 8th, 2011 AT 2:21 PM
Tiny
WRENCHTECH
  • EXPERT
  • 20,758 POSTS

Does your check engine light come on for bulb check when the key is turned on?
Are you positive that you have spark?

Was this
answer
helpful?
Yes
No
-1
Thursday, September 8th, 2011 AT 2:24 PM
Tiny
LOST
  • MEMBER

IT COMES ON WHEN STARTING. IT USED TO GO OFF WHEN IT STARTED. CHECKING AGAIN FOR SPARK. STANDY BY

Was this
answer
helpful?
Yes
No
-1
Thursday, September 8th, 2011 AT 2:27 PM
Tiny
LOST
  • MEMBER

OK THERE WAS SPARK

Was this
answer
helpful?
Yes
No
Thursday, September 8th, 2011 AT 2:29 PM
Tiny
WRENCHTECH
  • EXPERT
  • 20,758 POSTS

Your symptoms are pointing to either a bad Engine Control module or Ignition control module. It will require some "in depth" testing to confirm either.

Was this
answer
helpful?
Yes
No
Thursday, September 8th, 2011 AT 2:32 PM
Tiny
LOST
  • MEMBER

I WAS AFRAID U WERE GOING TO SAY THAT! THANK YOU FOR ALL OF YOUR HELP. IT IS NICE TO FINALLY FIND A WEB SITE THAT WORKS FOR ME! SINGLE MOM, NEED ALL THE HELP I CAN GET. WHAT DO U THINK ABOUT GETTING EITHER A ECM OR ICM FROM ANOTHER EXPO AT A JUNK YARD TO KEEP MY COSTS DOWN?

Was this
answer
helpful?
Yes
No
Thursday, September 8th, 2011 AT 3:10 PM
Tiny
LOST
  • MEMBER

SO IS IT AS EASY TO BUY A NEW ONE AND INSTALL AND EVERYTHING IS OK? WHAT IF THE TIMING BELT IS OFF, HOW DO U ADJUST THAT?

Was this
answer
helpful?
Yes
No
Thursday, September 8th, 2011 AT 4:17 PM
Tiny
KHLOW2008
  • EXPERT
  • 42,001 POSTS

Remove the ECU and open the covers to check for signs of corrosion, leaking capacitors etc. If the ECM is the component is at fault, replacing it should solve the problem. Yes, a junk yard component should be good enough as it does not matter if the component is new or used as such components are rather reliable.

If the timingbelt is off, you would need to turn the crank to TDC on compression stroke for cylinder #1 and release the tension of the tensioner with the aid of a long bolt to push and hold the bracket. The tensioner pin should be held in position with a pin and then the tensioner bearing is released.

Was this
answer
helpful?
Yes
No
Thursday, September 8th, 2011 AT 6:23 PM
Tiny
LOST
  • MEMBER

UPDATE: Tried to hook up monitor that reads the computer and it would not read ANYTHING! Does that mean it is the ECM since no readings? I need to get this car running again. HELP!

Was this
answer
helpful?
Yes
No
Wednesday, September 14th, 2011 AT 10:33 PM
Tiny
KHLOW2008
  • EXPERT
  • 42,001 POSTS

You might have a blown fuse somewhere.

Ensure terminal # 16 of the DLC has battery voltage.

Was this
answer
helpful?
Yes
No
Please consider a donation if we helped you
Thursday, September 15th, 2011 AT 1:21 PM

Please login or register to post a reply.

Recommended articles