teamlegacy

Alright guys, here's the background information on the issue. I've got a 92 Accord DX with a swapped in F22A6 motor and it's Turbo'd to around 8-10 psi. I pulled her down yesterday, pulled the plugs and did a compression check and a leakdown test. Compression on all cylinders was between 148-152 and the leakdown showed less than 20% on all the cylinders.

I saw I needed plugs, so I put them back in and as soon as I started her up she had a dead miss at idle. Weird, I figured it would smooth out so I drove home. Drove this morning and still had the same dead miss at idle, but driving any other speed is fine and boost is fine, power is there and like you can see above, compression and leakdown tests show nothing.

I came to my shop today, changed out the plugs and swapped cyl #1 wire and it still has the dead miss. I pulled the dist. cap and found some oil in it from the distributor shaft so I swapped it out with a known distributor with less than 500 miles on it new. Cleaned the cap and tightened her down and the same miss is still there.

So I have compression, I have spark and clean, smooth spark at that, so on to fuel. With a stethoscope I checked all 4 injectors, all of which are clicking rather smoothly with no hesitations. So there are no blockages in there, they are moving smoothly. I went on and pulled the fuel rail up and pulled the #1 injector out. I cleaned her with some fuel system cleaner and also checked that fuel was getting there, and it is. I put it all back together and started her up, STILL THAT DAMN DEAD MISS!

I'm out of ideas. There appears to be current going to the injector electronically and it just happened completely out of the blue.

I am running a chipped p75 with Crome, so the "tuner" is coming by a little later to check the values, but geez! Only at idle it misses, everything else is fine, maybe a little lean but I can't complain too hard.

Cliffnotes:
Accord with a dead miss at idle, cyl #1 is to blame.
-Compression is dandy
-Leakdown showed less than 20%
-Injector is getting fuel and is clicking
-Plugs are new and wire is not fault
-Distributor is new and cap is clean

WHAT THE HELL! HELP!!!!

Colin

EASY101

sounds like the spark still isnt getting there...

teamlegacy

we've checked the spark. All 4 are getting spark.

It's sparking all the way to the plug and the plug is burning. How much more spark is possible?


Modified by teamlegacy at 8:58 PM 7/25/2006

EASY101

if its getting spark at idle all the way to the plug then its not misfiring at idle... unless you're not reattaching the wire correctly after reinstalling the plug...

teamlegacy

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by EASY101 &raquo;</TD></TR><TR><TD CLASS="quote">if its getting spark at idle all the way to the plug then its not misfiring at idle... unless you're not reattaching the wire correctly after reinstalling the plug...</TD></TR></TABLE>

Um, if it's not misfiring how do you explain the MISS AT IDLE? It's misfiring, definetly, you can feel it in the engine and also it has the misfire sound from the exhaust. It's getting spark, it's getting fuel, it has compression. The wire is attached correctly, I find it hard to imagine I've incorrectly installed a wire probably about 8-10 times today alone.

Also, just because it has spark doesn't mean it won't misfire. Other things cause a misfire besides just faulty spark or ignition breakdown. Don't be misinformed.

EASY101

maybe you have a vaccum leak, or its a timing issue?

teamlegacy

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by EASY101 &raquo;</TD></TR><TR><TD CLASS="quote">maybe you have a vaccum leak, or its a timing issue?</TD></TR></TABLE>

If it were a vacuum leak it would register across all cylinders. It only registers the misfire on cylinder 1. I can pull the wire and nothing happens, but on all the others it bogs down worse. Unless the vacuum was leaking at the I.M. gasket at cylinder 1 would that be an issue, but it's not leaking there.

Timing is perfect and again, it wouldn't cause one cylinder to be down and the others fire normally.

jagged4698

Maybe volume is your answer? Possible not enough spark/fuel at idle?? Tried hooking a pressure guage up to your fuel system and see what it sits at idle and at higher rpms?

teamlegacy

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by jagged4698 &raquo;</TD></TR><TR><TD CLASS="quote">Maybe volume is your answer? Possible not enough spark/fuel at idle?? Tried hooking a pressure guage up to your fuel system and see what it sits at idle and at higher rpms?</TD></TR></TABLE>

Fuel Pressure is 45-46 psi at Idle. Problem is only evident at idle, under a load or with raised RPM's the car runs fine.

someone else

Maybe an intake mani. leak at #1 leaning out #1 at idle. Swap #1 and #4 injectors and see if it moves. I'd do the same with the plugs. You seem to have covered most everything else I can think of.

hondaccord

ok I don't know this engien all the way, but a blocked egr port on the runers seems like it would do that. also when was the last time you changed your wires, if it is arching on the first wire that might do that just at idle. once agian that just general stuff that you didn't say that you checked, but good luck with it.

teamlegacy

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by someone else &raquo;</TD></TR><TR><TD CLASS="quote">Maybe an intake mani. leak at #1 leaning out #1 at idle. Swap #1 and #4 injectors and see if it moves. I'd do the same with the plugs. You seem to have covered most everything else I can think of.</TD></TR></TABLE>

Injectors 1 and 2 were swapped and the same problem is at 1. I would doom the intake manifold if it were happening across the board of it the car ran like **** other than idle.

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by hondaccord &raquo;</TD></TR><TR><TD CLASS="quote">
ok I don't know this engien all the way, but a blocked egr port on the runers seems like it would do that. also when was the last time you changed your wires, if it is arching on the first wire that might do that just at idle. once agian that just general stuff that you didn't say that you checked, but good luck with it. </TD></TR></TABLE>

The EGR port is next to cylinder 4, not one. We thought of the same thing, but I suppose anything is possible. Is there a way to check for blockoff aside from pulling the intake manifold off?

railtech

My Experience: Had misfire under load, spark was ok, fuel press. was ok, compression was ok, timing ok.

Come to find out one of the injector wires was chaffed against the fuel rail. Simply taped it up and repositioned and voila!

I know you said it only misses at idle but maybe you have a similar situation, my car had injectors that used two sets of wires to actuate the injector- one for idle and one for above idle throttle settings. Not too sure about your engine though, but it couldnt hurt to look.

Hope you find the problem soon sounds like you got a sweet ride and watching it sit must be killing you.

teamlegacy

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by railtech &raquo;</TD></TR><TR><TD CLASS="quote">My Experience: Had misfire under load, spark was ok, fuel press. was ok, compression was ok, timing ok.

Come to find out one of the injector wires was chaffed against the fuel rail. Simply taped it up and repositioned and voila!

I know you said it only misses at idle but maybe you have a similar situation, my car had injectors that used two sets of wires to actuate the injector- one for idle and one for above idle throttle settings. Not too sure about your engine though, but it couldnt hurt to look.

Hope you find the problem soon sounds like you got a sweet ride and watching it sit must be killing you.</TD></TR></TABLE>

I wondered the same thing because oil feed line runs right up next to it. I figured maybe the stainless steel braiding was giving the current interference so I made sure it wasn't near it and still same thing. I'll check the wires for chaffing but it never looked like the line was on wires, just the harness plug.

You're right, at this point, I'll try any damn thing. And oh, she doesn't sit. I just hate stopping at a stoplight. She drives smooth as a button other than idle, I just stay out of boost or at low psi to try and avoid a lean/rich misfire higher up since there is something faulty on #1.

hondaccord

I forgot exactly were, but do a search, cuse I know they have the pics and all of how to do the egr port cleaning, on hear.

teamlegacy

Here's my dilemma with that theory. My EGR is blocked off and my P75 does not recognize an EGR even existing. Wouldn't a bad EGR or blocked EGR condition allow the vehicle to run bad the whole rev range and while driving? The car runs fine above idle.

teamlegacy

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by hondaccord &raquo;</TD></TR><TR><TD CLASS="quote">I forgot exactly were, but do a search, cuse I know they have the pics and all of how to do the egr port cleaning, on hear.</TD></TR></TABLE>

UPDATE: FIXED!!!! I pulled the EGR block off plate off and blew some compressed air down the service ports, put a new gasket on there and she fires up and doesn't miss for ****. THANK YOU HONDACCORD for the suggestion!!