1998 Mitsubishi Eclipse

Tiny
SAM WRIGHT
  • MEMBER
  • 1998 MITSUBISHI ECLIPSE
  • 4 CYL
  • 2WD
  • AUTOMATIC
  • 110,000 MILES
I have a 1998 mitsubishi eclipse 2.0 non turbo with an automatic transmission. My problem is no injector pulse on # 4 cylinder (only). It pulses once when you start cranking and once again when you stop cranking. The engine starts but runs poorely. I have spark on all cylinder, 45 to 50 fuel psi and compresson of 125lbs per cylinders.
Could you tell me what could be the probably cause of no injector pulse on #4 cylinder?
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Tuesday, November 18th, 2008 AT 10:48 PM

3 Replies

Tiny
JAMES W.
  • MEMBER
Sam, I've done a lot of computer work over the years, but this a new one to me. The injector ground comes from a junction block below the relay box under the hood. This 12 volts feeds both #2 & #4 injectors. The power has to be good or you would have 2 dead injectors. The ground control for #4 injector (light green / red tracer) comes from terminal #15 on the engine control unit. This circuit has to be good, or you wouldn't have a pulse at all. I has to be in the ECM itself. Either a blown capacitor or diode. I've never seen this before, but then again, there's a lot of things I haven't seen. If I was in your position, I'd change the ECM. Hope this helps.
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Wednesday, November 19th, 2008 AT 12:45 AM
Tiny
SAM WRIGHT
  • MEMBER
In reviewing my problem, Ihave a missfire in both #2 and #4 cylinders. I have power to them but the ground is not coming from the ECM. I only get one pulse when I first begin to crank. I checked directely from the computer and nothing. I even tryed putting another ECM in and that did't help.
Any suggestions. Please give me a hand Thanks.
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Thursday, November 20th, 2008 AT 6:25 PM
Tiny
JAMES W.
  • MEMBER
Sam, The plus voltage comes from a junction block under the relay box in the engine compartment terminal #15, blk/red wire according to the diagram. Also, #2 and #4 injector grounds are tied together somewhere in the circuit. Check continuity from #15 on the junction block to the blk/rd wires on injectors #2 & #4. Let me know what you find.
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Saturday, November 22nd, 2008 AT 2:30 PM

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