a1320honda

Ive been chasing this gremlin for about 2 weeks now. Everyday driving the car is fine. But under boost it starts building and goes to 22psi and starts breaking up and missing and popping. Found out that the BOV was venting ALOT of boost straigh out. Would that be causing the misfire like problem? Im also getting liquid into cylinders 4 and 3. But the Compression is 150 across the board and leakdown showed 4% across. The low compression is cause its got Ross 8.1 pistons and a Cometic .030 headgasket. I havent fixed the BOV yet, but just wanted to see what everyone thinks so far. Im at my wits end!

Edit 1/7/09
So far things that have been done or replaced
plugs, wires, cap, rotor, coil, igniter. Then a whole different dizzy. Different ECU. Found an issue with the fuel pressure regulator so pulled it off and put on an aeromotive. Had the injectors cleaned and flowed with new filters. Thought maybe a blown headgasket, so pulled the head and had it checked, and was perfect. found some scarring on the cylinder walls so i went through the bottom end and put in new rings. Reassembled everything and still having the same problem. Put in a brand new Walbro 255lph H.O. Checked and added ground straps on the motor. It seems that the longer we drive, the worse it gets. And its only when you start putting a load on the motor in boost. Closed the gap on the plugs down ro .024". Tomorrow im gonna try and put in my GM 3bar map sensor and wire in another resistor box. Anyone else think of anything, cause i sure as hell cant!

0mtber

iTrader: (2)

Your boost leak would not cause an ignition missfire.

marcj

what did the AFR look like when it breaks up? have you tried another distributor? I've had so many problems just with distributors, that's the first thing I check.

96 GSR-T

Check your coil, I chased an issue for a while because I was convinced my fresh dizzy was not to blame.... and it was.

Car drove fine around town once I got over 15-16psi that car was loading up and misfiring, turned out the coil was weak and on its way out.

Turbo-LS

iTrader: (4)

if your getting liquid AKA coolant into the cylinders then you probably popped the headgasket. if the car tuned properly? what are your a/f ratios in boost? are you running headstuds? whats the whole setup so people can better help. always post the setup dont be vauge. what are your plug gaps?

boost leak will not cause breaking up, poor tuning will, to big of a plug gap will, coolant in the cylinders will

a1320honda

Sorry
setup is:

AEBS closed deck 83mm b18a
Ross 8.1 pistons
Pauter rods
Cometic .030 head gasket
GSR head
Full Brian Crower valve train
Skunk 2 Pro 1 cams
ARP headstuds TQ'd to 85ft/lbs
Timing on the map is very safe
NGK BKR7E plugs gapped at .022
AFR in boost is 11.5-11.9
This is all on pump gas

Ive tried everything electrical. plugs, wires, cap, rotor, coil, igniter, then the whole dizzy. I thought it might have been a fuel issue, so i had the injectors flowed and cleaned. Injectors are within 4% of each other. Put on a new aeromotive A1000 fuel pressure regulator. New fuel pump, new filter. Nothing changes.

If it was a blown headgasket, wouldnt the leakdown or compression test show it?

Turbo-LS

iTrader: (4)

not always but if your getting coolant into cyl 3-4 id say sunk sleeve or bad HG

a1320honda

I guess its just time to tear it apart and find out.

legomytego

i wouldent tare it apart just yet i am having the same problem i thought i was getting oil on the plugs threw the 4 valve cover rubber grommets so i replace them but same problem and my boost cut is set at 22 psi thru s300 also. but check them if you havent cheap and easy fix.

Karl Buchka

Have you tried colder plugs?

legomytego

i am running ngk bkr7es

neno978

you checked the gasket on the wastegate might be blown or the wastegate might be bad check

a1320honda

Ok, so far: Pulled the head off and the head is very flat, top of the block is very flat, what i thought was a dropped sleeve that initialy looked like it dropped about .0015" didnt. We put a staright edge on it and couldnt get a .0015" feeler to slide under.

But we noticed that when we pulled the head, the ARP headstuds on the far exhaust-passenger side and the one next to it on the exhaust side were EXTREMELY gooped (thick, chunky oil) up. It looked like they had 300 thousand mile oil on it. You could smell the gas and combustion on those. Cylinders 3 and 4 are the ones that were letting oil and coolant in. So could i be lifting the head at 22psi, the head gasket didnt look like it was leaking past at all? It had a Cometic .030" head gasket on it.

Checked the wastegates and they are all good, no torn diaphrams or leaks. Turbo is blowing a very slight bit of oil in the charge pipe but its not making it into the intake manifold.

Considering that i was losing alot of water and obivoulsy oil that it was coming in through the head/block mating surface, but i dont know for sure where. Before i pulled the head i checked the TQ on the ARP's and they were still at 85ft/lbs.

So....anyone????

a1320honda

bump for edit