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
  • 109,747 POSTS
Have you checked to see if the fuel pressure is within spec? If it isn't, have you checked the regulator?
Was this
answer
helpful?
Yes
No
Thursday, July 11th, 2013 AT 7:16 PM
Tiny
ROCKY SAUNDERS
  • MEMBER
  • 8 POSTS
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.
Was this
answer
helpful?
Yes
No
Friday, July 12th, 2013 AT 5:55 AM
Tiny
ROCKY SAUNDERS
  • MEMBER
  • 8 POSTS
I think possibly it's the computer. Or a vacuum leak.
Was this
answer
helpful?
Yes
No
Friday, July 12th, 2013 AT 5:56 AM
Tiny
ROCKY SAUNDERS
  • MEMBER
  • 8 POSTS
I also replaced fuel pressure sensor.I replace the fuel filter just to make sure. Also check voltage to all emission parts.
Was this
answer
helpful?
Yes
No
Friday, July 12th, 2013 AT 6:33 AM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,747 POSTS
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.
Was this
answer
helpful?
Yes
No
Friday, July 12th, 2013 AT 7:43 PM
Tiny
ROCKY SAUNDERS
  • MEMBER
  • 8 POSTS
Than doing that tomorrow and smoke machine.
Was this
answer
helpful?
Yes
No
Friday, July 12th, 2013 AT 7:52 PM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,747 POSTS
Let me know what you find.
Was this
answer
helpful?
Yes
No
Friday, July 12th, 2013 AT 7:55 PM
Tiny
ROCKY SAUNDERS
  • MEMBER
  • 8 POSTS
Sure will. Than for the input.
Was this
answer
helpful?
Yes
No
Friday, July 12th, 2013 AT 9:52 PM
Tiny
ROCKY SAUNDERS
  • MEMBER
  • 8 POSTS
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.
Was this
answer
helpful?
Yes
No
Saturday, July 13th, 2013 AT 12:54 PM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,747 POSTS
If you have 19 lbs vacuum, it should be fine, but you could have one low cylinder.
Was this
answer
helpful?
Yes
No
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
Was this
answer
helpful?
Yes
No
Sunday, July 14th, 2013 AT 9:58 AM
Tiny
ROCKY SAUNDERS
  • MEMBER
  • 8 POSTS
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.
Was this
answer
helpful?
Yes
No
Saturday, July 20th, 2013 AT 10:41 AM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,747 POSTS
Glad you got it fixed.
Was this
answer
helpful?
Yes
No
Saturday, July 20th, 2013 AT 4:45 PM

Please login or register to post a reply.

Sponsored links