Ok im getting a misfire cel 74. My car drive and ifles normal. I have no idea what is causing this cel. I have changed distributor cap and switched to another working dirstirbutor. I have changed new spark plugs and new spark plug wires.
I swapped around the injectors and still i get this CEL!!! When im using the obd1 ecu, i get no cel. Its only when i run the obd2 ecu.

Someone help me out, this is really bugging me

 

 

somebody knows

 

OBD1 doesn't have a misfire detection system like OBD2 does. You need to give more info like what car, engine, ECU, etc...

Are you using OEM ignition components for the cap, rotor, wires and plugs?

Any other maintenace or modifications done to the engine?

 

Ok my car was fine when it was stock. I turboed the car, leaving the everything else stock. I changed out the ecu for a chipped bod1 ecu. Everything ran good.

Then i decided to go back to stock and went back to using my obd2 ecu. And that was when i got the misfire cel. I got new plugs, new wires, and new cap. I then tried using my friends distributor and his obd2 ecu and i still got the same cel.
Then i tried switching the injectors around, but it still had it in cylinder #4.

But the thing is, the whole time my car runs fine with no major signs of misfire. One couldnt tell if it wasnt for that cel.

Thank you for replying

 

plugs- New stock copper ngk's for a ls
wires- New NGK's for a gsr
ignition system- stock honda
injectors- obd1 injectors
fuel pump- walboro 255hp
ecu- obd2 p72

 

What is your fuel pressure? Do you have an adjustable FPR or stock? Can you go back to the stock fuel pump? Can you do a compression/leakdown test?

 

I dont know my fuel pressure and my fpr is stock. I dont think i can find my stock fuel pump. I did a compression check it checked out great with all cylinders within 5psi or less between them. I havent done a leakdown test though.

I will try replacing my fuel fitler later today. What do you think it is?

 

ttt

 

ever figure this one out ? iv done about the same as you and iv still got misfires as well :\

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Vera &raquo;</TD></TR><TR><TD CLASS="quote">ever figure this one out ? iv done about the same as you and iv still got misfires as well :\</TD></TR></TABLE>
Hey whats up bro. I did the vavle adjustment and i still got the cel! I ended saying screw it, and went obd1, installed the turbo back, and threw got it dyno tuned. It wasnt anything Tuner said something about electronic being off or something. I think you should be ok man

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by b00sted4dr &raquo;</TD></TR><TR><TD CLASS="quote">
Hey whats up bro. I did the vavle adjustment and i still got the cel! I ended saying screw it, and went obd1, installed the turbo back, and threw got it dyno tuned. It wasnt anything Tuner said something about electronic being off or something. I think you should be ok man </TD></TR></TABLE>

not sure, i can feel my misfires even more hah :\

 

what is the gap on the plugs?

 

i hope you checked the compression adn checked for bent valves first

 

i checked compression, and all cylinders checked out at 210 across the board.
The spark plugs came gapped at .035.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by b00sted4dr &raquo;</TD></TR><TR><TD CLASS="quote">i checked compression, and all cylinders checked out at 210 across the board.
The spark plugs came gapped at .035. </TD></TR></TABLE>

i have 180 to 185 across the board , gsr .. .
and i have spark plugs gapped at .50

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Vera &raquo;</TD></TR><TR><TD CLASS="quote">

i have 180 to 185 across the board , gsr .. .
and i have spark plugs gapped at .50</TD></TR></TABLE>

healty gsrs have 240 or more and a .50 gap sucks ***

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by D@nnY &raquo;</TD></TR><TR><TD CLASS="quote">

healty gsrs have 240 or more and a .50 gap sucks ***</TD></TR></TABLE>

240 ? you sure you not thinking all motor ? with high performance parts .. this is stock ... helms max compression says 200 and iv seen a decent amount around 180 ..... also . .as i said before .. this is a stock application ... helms says a .51 gap in the spark plugs ... not sure what info your telling me ..but its not right .. thanx for the reply

 

could be 80 psi across all 4 on one gauge, and 250 across all 4 on another gauge.

You really shouldn't judge an engine on the actual numbers, but rather the consistancy......I'd do a proper valve adjustment and redo the test. I'm sure the numbers will change slightly

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Vera &raquo;</TD></TR><TR><TD CLASS="quote">

i have 180 to 185 across the board , gsr .. .
and i have spark plugs gapped at .50</TD></TR></TABLE>
are your numbers on a cold motor or when its warmed up?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by b00sted4dr &raquo;</TD></TR><TR><TD CLASS="quote">
are your numbers on a cold motor or when its warmed up?</TD></TR></TABLE>

this is when the motor is warm