Engine misses above idle. But if I pinch fuel over flow and increase fuel pressure it runs fine.

Tiny
ROCKY SAUNDERS
  • MEMBER
  • 1992 HONDA ACCORD
  • 180,000 MILES
Engine starts runs at idleas soon as you give it throttle it missesthe more throttle you give it the more it misseshave checked the egr. If I pinch off overflow for fuel bypass And rises fuel pressure significantly it runs fine. The only code it shows ck engine light stays on all the time.
Thursday, July 11th, 2013 AT 4:14 PM

13 Replies

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 110,144 POSTS
Have you checked to see if the fuel pressure is within spec? If it isn't, have you checked the regulator?
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Thursday, July 11th, 2013 AT 7:16 PM
Tiny
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Fuel pressure is within specs eGR valve is fine have checked everything except for smoking to find vacuum leaks. When looking for codes check engine light just stays on and there's no codes flashing. But when pinching off return line fuel pressure jump to a hundred it runs fine. Idle is smooth.
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Friday, July 12th, 2013 AT 5:55 AM
Tiny
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I think possibly it's the computer. Or a vacuum leak.
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Friday, July 12th, 2013 AT 5:56 AM
Tiny
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I also replaced fuel pressure sensor.I replace the fuel filter just to make sure. Also check voltage to all emission parts.
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Friday, July 12th, 2013 AT 6:33 AM
Tiny
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If you are sure the fuel pressure regulator is good, then check intake vacuum to see what kind of reading you get. It should be around 17.
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Friday, July 12th, 2013 AT 7:43 PM
Tiny
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Than doing that tomorrow and smoke machine.
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Friday, July 12th, 2013 AT 7:52 PM
Tiny
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Let me know what you find.
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Friday, July 12th, 2013 AT 7:55 PM
Tiny
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Sure will. Than for the input.
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Friday, July 12th, 2013 AT 9:52 PM
Tiny
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Haven't done of smoke test yet vacuum is 19 lbs. I suppose I should do a compression test to. I just can't figure out why when fuel pressure gets above 70-80 lbs it runs fine.
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Saturday, July 13th, 2013 AT 12:54 PM
Tiny
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If you have 19 lbs vacuum, it should be fine, but you could have one low cylinder.
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Saturday, July 13th, 2013 AT 8:38 PM
Tiny
MOLSONCANADIAN
  • MEMBER
  • 81 POSTS
Have you checked your EGR Flow ports? There is about 4-6 holes the size of a dime which get plugged up with carbon which causes hesitation and misfires once the engine warms up/ EGR kicks in.

The 90-93 Accords were recalled due to this and I had the exact same problem.

You can check out this different website below:
home. Comcast. Net/ em-engineering/T2T013. Pdf
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Sunday, July 14th, 2013 AT 9:58 AM
Tiny
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Compression was 146 to 150 Replaced the ECU with known good one. Replaced cap rotor plug wires. After all that BS it ended up being sticky injectors. Which I thought about to begin with, but ask a couple of Honda mechanics and was told they are either bad or good. Used a concentrated cleaner and canister with air pressure ran it for 20 minutes and it runs fine Now. Thank you for all your input.
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Saturday, July 20th, 2013 AT 10:41 AM
Tiny
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Glad you got it fixed.
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Saturday, July 20th, 2013 AT 4:45 PM

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