More misfiring

[Cloud]

Well, here is the breakdown. I am running e85, cyclone manifold (and cyclone coils), bpr7es plugs gapped to about .24, accel 8mm wires. I get misfires when I am running around 25psi or more. I rechecked my plug gap, I tested the cyclone coils (and my primary resistance was good, my secondary resistance was a couple kohm lower and fell into the earlier 1ga specs...). I replaced my fuel filter and added some more fuel and the misfiring got better but hasn't completely cleared up. It's perfectly fine around 22psi. Any thoughts? I was wondering about the coils being of the earlier spec maybe not helping, or possibly since my plug wires are kind of tight reaching to the cyclone coil packs or maybe still needing more fuel although I added a bit more and it didn't get better...

[Ghettodsm]

power transistor, maybe?

[Cloud]

power transistor, maybe?

Will that give you problems just at high boost though? I thought it was typical for that to show up as car just wont start or runs absolutely horribly if it fails.

[yokotabrat]

I've had a coil pack do the exact thing you're talking about. Swapped for a lower mileage coil pack with no other changes, and no more stuttering at high boost. I can't remember if it measured in spec or not. I still have it at home and can measure it tonight to find out for sure.

[prophecymiller]

Maybe as the parts heat up they are not working nearly as well anymore...so you would show they test fine but when under operating temps, they are getting shortchanged.

You could also re-gap the plugs at .020 to see if that helps. You could also test the resistance on the plug wires?

[thiazole]

I was having a pretty bad misfiring problem with my car and it turned out to be the battery - it was just getting on the old side (~5 years) and wasn't keeping up, but seemed to be fine otherwise. Before I figured out the cause of this problem, I found that leaning it helped. I could handle a lot more boost when the WB was showing 11.7:1 than I could at 11:1 (also on E85).

[Cloud]

Hmmm, well I don't think my battery is crapping out quite yet. It's a pretty hefty unit with only about a year on it. I guess I am going to have to do some physical trouble shooting like put my old coils back on and see how it does, or try really hard to separate the plug wires with some loom or electrical tape or something. I am pretty convinced that it is back to ignition at this point because no matter how rich I go it doesn't get any better after the point it is at now. It did do WORSE when I leaned it out before though. I might regap the plugs or get a set of 8's at some point as well just as a tuning aid. It cant hurt to have a set of all 3 heat ranges kicking around just in case anyhow.

[t_jolt]

Cloud give me a call, I had a horrible firing problem. I have a ton of idea's


Tyrel

cell 720-988-0353

[Ghettodsm]

have you opened your ecu? I did and found 1 chip was burned! I'm hoping that fixes my idle surge and stutter at boost and warm up issues.

[drcustom]

have you opened your ecu? I did and found 1 chip was burned! I'm hoping that fixes my idle surge and stutter at boost and warm up issues.

I'm not surprised since you have a 1g, but it's definitely not a common cause (That I've heard of anyways).

If you need another and want to send me a PM I might have a replacement for you.

[Cloud]

have you opened your ecu? I did and found 1 chip was burned! I'm hoping that fixes my idle surge and stutter at boost and warm up issues.

I have opened it in the last month or so and it was still pristine. I found a rediculous ebay deal on a near brand new factory replacement eprom ecu and it has been very nice to me so far. I will check it again though if I can't find another cause for my ignition woes.

[Cloud]

Well as an update... I did some playing with it today. Swapping in old coils did nothing. Also it isn't heat related as today its pretty cool out and first thing I did when the electronics were still just warmer than ambient was go out and misfire an assload. It's so funny because it works nearly perfectly at 22psi and just completely gives up at 26psi or so. It's almost impossible to tell if it's fuel related too because of the misfires dumping so much unburnt crap into the exhaust the instant it happens, I can't get a useful o2 reading at all. I guess I'll give the plug wires a good look and then see if I can test the transistor next. I might try bumping my fuel pressure down to see if it makes a difference and see if I am just choking my pump with high boost and e85 fuel demands.

[thiazole]

Have you boost tested your car recently? I'm just wondering if a boost leak around one of your injectors could be causing one cylinder to run pig rich and missing under high boost (and the higher the boost, the more rich it would run). I know when I swapped out my injectors recently that the old seals looked a bit swollen from the E85.

[Cloud]

I have. There are no huge leaks. I have several pinholes but it takes at least a few minutes to bleed down from like 15psi to 5psi... It doesn't look like it's a boost leak. I haven't had a change to hook my fuel pressure gauge up as I lost my fitting for it aparently. I will make a trip to home depot sometime soon and hopefully be able to determine if the fuel pressure is dropping off fast and that's the problem.

[Cloud]

Well as an update on this. It isn't fixed yet, but I am thinking it's actually a combination of a few issues.

It has been getting worse. Since it has gotten colder I must run less and less boost to avoid the misfiring. As of today it would only run about 16psi and still occassionally miss but mostly be completely fine. It has also started running horribly at startup, it idles great, but when it drives it almost immediately stalls and stutters a lot until the rpm come up a bit and you get past light throttle. It is perfectly fine if it's cold started at like 70 degrees, or when it starts to warm up a little, but will still do the misfiring at wot.

I swapped in some old plug wires on a couple wires that don't fit so well with the cyclone coil pack location and magically I could run up to about 20-21psi without misfire in the same temperatures. I tried to run 24psi however and it cut HARD. I think I potentially have had two different misfiring issues, one being crappy ignition, and one being fuel delivery. I think I will have a better idea when I cold start it again tomorrow morning to see if that issue is still there or not. The miss at wot was as hard as fuel cut normally is and boost dropped instantly before I even backed out of it.

This is seriously making me consider building a COP setup soon. What are you guys impressions about the 300m coils? I hear a lot of mixed crap about them, but its only about twice the cost it would be for a new set of plug wires anyhow so if it will work out a little better with the cyclone I would be happy.

[D Walker]

I think the 300m coils work fine until you put a CDI to them, and then they crap right out. I honestly do not think they provide much more spark energy than OE coils and decent wires.
My ignition system works perfectly, is reasonably priced, and is currently running in a E85 car at around 28psi with no misfiring. It also plugs right in and takes about 10minutes to install.

[Cloud]

I think the 300m coils work fine until you put a CDI to them, and then they crap right out. I honestly do not think they provide much more spark energy than OE coils and decent wires.
My ignition system works perfectly, is reasonably priced, and is currently running in a E85 car at around 28psi with no misfiring. It also plugs right in and takes about 10minutes to install.

This is the one with CDI and stuff that is like $500+? I'm really not looking for anything super awesome, I know people have made like 600whp on stock components. I just don't want my wires crapping out ever, and at least enough spark energy to run 25psi or so on e85. It seems like stock would be fine, but I hate plug wires and if I can spend like $100 or so on parts and just make a setup I wont have to worry about anymore then I am all for it. If it's really not going to be worth it I'm sure I'll just get another ebay set of accel wires and call it good for another year, but I'm always for reliability mods.