Misfire - Honda Prelude Forum

gnxpro24 · 02-01-2013, 12:00 AM

Hey everyone,w hats happenin? Im having a problem with my Prelude lately. I keep getting a misfire code and at idle my car will shut off sometimes and when I start it, if I dont push the accel., the car will die again. Any ideas what it could be? Car has 128k on it and runs like a champ, besides the misfire. oh, and the plugs keep fouling out, turning black

gnxpro24 · 02-02-2013, 11:22 AM

Anyone? Ive tried new plugs, cleaned the egr, cap and wires are in good shape and fairly new.

gnxpro24 · 02-04-2013, 03:54 PM

Put a tank of 93 in and now the misfire has stopped for some reason. Now its throwing a 1491 EGR insufficient lift and vtec works off and on. Anyone?

digiforce · 02-04-2013, 05:38 PM

what exact misfire code are you getting. Also make sure there is no moisture in the wires

gnxpro24 · 02-04-2013, 10:29 PM

how can there be moisture in the wires? you mean where they fit over the spark plugs? and I was getting random misfire and a code for a misfire in each cylinder. misfire is gone now, only code is egr. oh and its idle surging like crazy even after warmup

gnxpro24 · 02-05-2013, 07:01 PM

Cleaned the egr valve and ports and fixed idle surge, still getting vtec code, tho. Any suggestions?

Kpro22 · 02-05-2013, 07:36 PM

I had a similar issue, i had a leak in my intake manifold gasket ,

gnxpro24 · 02-05-2013, 08:07 PM

Quote:

Originally Posted by Kpro22

I had a similar issue, i had a leak in my intake manifold gasket ,

which one of the problems Im having did replacing the gasket fix?

Kpro22 · 02-05-2013, 08:28 PM

mines had a cel for misfiring cylinder 1, and it kept idle surge when the car was warm up, after the gasket replacement it was all gone

gnxpro24 · 02-05-2013, 08:53 PM

Right now all the car has is a vtec code

digiforce · 02-06-2013, 03:23 PM

when i said engine code i meant the actually number when you plug a obo2 scanner in your port. Like im assuming your vtech code is code 21 or similar. Vtech is oil pressure related, Also take out the vtech solenoid and clean it off with carb cleaner.

In your original statement you said your plugs were fowling out and you were mis firing. That sounds like a air/fuel ratio issue considering you said running higher octane gas helped your misfire. i would say take your injectors out and clean them because it sounds like fuel is having an affect on your ignition. I would also say get a can of sea foam, pour it down your brake booster line and in your oil and let it run. (You can use kerosine if you choose they both clean up crap inside the engine).

bloodSHed · 02-06-2013, 04:18 PM

Quote:

Originally Posted by digiforce

when i said engine code i meant the actually number when you plug a obo2 scanner in your port. Like im assuming your vtech code is code 21 or similar. Vtech is oil pressure related, Also take out the vtech solenoid and clean it off with carb cleaner.

In your original statement you said your plugs were fowling out and you were mis firing. That sounds like a air/fuel ratio issue considering you said running higher octane gas helped your misfire. i would say take your injectors out and clean them because it sounds like fuel is having an affect on your ignition. I would also say get a can of sea foam, pour it down your brake booster line and in your oil and let it run. (You can use kerosine if you choose they both clean up crap inside the engine).

21 - VTEC Spool Solenoid Valve - P1253 (system malfunction)
22 - VTEC Pressure Valve - P1257, P1258, P1259 (system malfunction)

^ I assume you're getting one of these CEL codes?

gnxpro24 · 02-06-2013, 05:11 PM

The code is vtec circuit bank 1 or something like that

gnxpro24 · 02-06-2013, 09:29 PM

Vtec still works on and off, no code tho. Egr code is back, just cleaned the egr ports yesterday

digiforce · 02-06-2013, 11:23 PM

Quote:

Originally Posted by bloodSHed

21 - VTEC Spool Solenoid Valve - P1253 (system malfunction)
22 - VTEC Pressure Valve - P1257, P1258, P1259 (system malfunction)

^ I assume you're getting one of these CEL codes?

lol ya i deserve that, i was writing from my celly, didnt realize the auto correct.

Gnxpro24,
when you say ports do you mean the exhaust ports the egr mounts to, or the egr itself i actually opened up the diaphragm(like push the center rod up and down while spraying cleaner, to get it inside the egr itself. I believe there is a vacuum test that you can perform to check to see if its function properly but it could also just be bad

gnxpro24 · 02-07-2013, 12:02 AM

I cleaned the egr and the ports on the intake manifold

gnxpro24 · 02-07-2013, 06:33 PM

Replaced the egr vac solenoid today so no more egr code but now I have a misfire again. I was on the way to the gas station. As soon as the needle it "E" on the gas gauge it started misfiring and now even after fuel fillup, the car misfires and shuts off at idle under 2k. What the hell is up with this ****? I wanna convert to obd1 soon with a chipped p28, think that would get rid of the bull**** codes Im getting?

digiforce · 02-07-2013, 11:05 PM

Quote:

Originally Posted by gnxpro24

Replaced the egr vac solenoid today so no more egr code but now I have a misfire again. I was on the way to the gas station. As soon as the needle it "E" on the gas gauge it started misfiring and now even after fuel fillup, the car misfires and shuts off at idle under 2k. What the hell is up with this ****? I wanna convert to obd1 soon with a chipped p28, think that would get rid of the bull**** codes Im getting?

definatly sounds fuel related. Clean out your fuel lines and pull out the injectors so you can clean them too. have you checked the fuel filter as well?

gnxpro24 · 02-08-2013, 12:30 AM

just replaced the fuel filter yesterday. how do i clean the injectors? put power to them so they allow cleaner to run through?

TypeT · 02-08-2013, 01:09 AM

DIY:Cleaning Fuel Injectors. - Honda Forum : Honda and Acura Car Forums

or

find a company which does Ultrasonic Cleaning/washes, you cannot clean them that good by yourself