[obsidiansti]

Hey guys,

Randomly today my car started bucking heavily under acceleration. It doesn't feel like a miss. It is a pretty violent jerking feeling. 2e9f and 2f9e were thrown at some point. I'm currently running a jb4 with an intake. I'm in a bind as I am traveling for work in Huntsville and I have to be in Birmingham this evening. I haven't had time to mess with it at all. It is just parked at my office here. Does anyone have any ideas or thoughts? Any help would be appreciated.

Thanks

[AtlantaDude]

I'm sorry to tell you this man, but I had the exact same thing. I've been chasing the issue ever since. I've replaced both Vanos solenoids, plugs and coils, had the valves cleaned, and now at the point of replacing the injectors.

Luckily, turning the car off and letting it set for a minute usually clears the issue, for now. Stay off WOT and it shouldn't come back too much. Good luck though.

[obsidiansti]

Thats good to know that it goes away. I honestly thought the engine was about to blow. I don't mind chasing it down, I just want to be able to get to where I need to be tonight.

[obsidiansti]

I was able to drive to Birmingham with no issues after letting the car sit. I'm baffled at what this can be. How often do you see this pop up Bear?

[litxus]

Originally Posted by obsidiansti

I was able to drive to Birmingham with no issues after letting the car sit. I'm baffled at what this can be. How often do you see this pop up Bear?

I'm having the same issue and all I see is 2E9F after multiple clearing of codes. I did replace the vacuum lines by the oil filter housing (one seemed bad), but the issue is still there. My next idea is to replace all remaining vacuum hoses.

In short it only happens on harder acceleration (not even WOT), check engine light comes on, car starts running like crap. Then restart the car and in most cases no check engine light and it runs normally.

[MacR6]

I have the same problem minus the codes. Went to change the plugs and found oil in two of them. The valve cover gasket has a leak and was letting oil in on the plugs. Car runs fine till I hammer it.

Good luck

[allan]

Originally Posted by MacR6

I have the same problem minus the codes. Went to change the plugs and found oil in two of them. The valve cover gasket has a leak and was letting oil in on the plugs. Car runs fine till I hammer it.

Good luck

I had a cracked valve cover and similar symptoms during hard acceleration. After replacing the valve cover it almost went away.
The rest I believe is the carbonized intake.
The N54 design relies heavily on an intact vacuum system, maybe the broken seal is part of the cause.

[litxus]

Originally Posted by MacR6

I have the same problem minus the codes. Went to change the plugs and found oil in two of them. The valve cover gasket has a leak and was letting oil in on the plugs. Car runs fine till I hammer it.

Good luck

My codes come on and off, basically after restarting the car check engine light is no longer there but if I scan for codes I still find that 2E9F. I replaced diverter valve seals as per diy I found o b...boost and also replaced vacuum hoses near the oil filter housing. The issue is still there, I guess replacing the rest of vacuum tubing is next as well as checking valve cover.

[mike@x-ph.com]

Logs?

[MJ80.]

Same thing in mine when I ran procede, massive violent jerk at redline Wot. If I shift just before redline it's 100% okay, cleaned vanos solenoids as suggested and got no improvement.

I have a leaky valve cover gasket also, found oil in one of the plug holes. Perhaps This is a factor? Someone mentioned it before. Car runs perfectly apart from reline, when I removed the procede the issue has stopped.

[litxus]

Originally Posted by mike@x-ph.com

Logs?

No logs, unless there is a way to do it with BT cable. I had some choppiness even with Procede (at WOT) which I had a while ago (about a year ago) and I have BB / wedge flash now. I wonder what would be the symptoms of a cracked charge pipe, as car runs rougher when cold (more sensitive to throttle and bogging at even lighter throttle), but fine when warms up, unless I give it a bit more go.

[mike@x-ph.com]

Originally Posted by litxus

No logs, unless there is a way to do it with BT cable. I had some choppiness even with Procede (at WOT) which I had a while ago (about a year ago) and I have BB / wedge flash now. I wonder what would be the symptoms of a cracked charge pipe, as car runs rougher when cold (more sensitive to throttle and bogging at even lighter throttle), but fine when warms up, unless I give it a bit more go.

You actually can do logs with a BT cable.

[litxus]

Originally Posted by mike@x-ph.com

You actually can do logs with a BT cable.

Never logged really, but will try just not sure where to start.

[litxus]

Finally fixed the issue. It was the damn plugs all along, as I thought car dying on boost was boost related, so replaced all vacuum tubing, dv o-rings and was thinking charge pipe next. Now after new plugs no problems on WOT.

[Karbon]

Originally Posted by litxus

Finally fixed the issue. It was the damn plugs all along, as I thought car dying on boost was boost related, so replaced all vacuum tubing, dv o-rings and was thinking charge pipe next. Now after new plugs no problems on WOT.

Easy fix at least.

Was having misfire issues all of a sudden, replaced the plugs and car runs smooth again. Damn plugs don't last long at all! Lol.

My 2003 Mazda6 had the original plugs when I traded it in at 80k. Still ran like new! Dealer said no need to replace them when I did a 70k service.

[els_86]

seems the valve cover gasket is a major problem on so many of these cars. How is this not a service recall warranty like the HPFP and turbos? Clearly the valve cover gasket isn't just suppose to leak like this, yet so many people on have this problem and have to spend like 500 bucks to fix if not under warranty.

[MJ80.]

Originally Posted by litxus

Finally fixed the issue. It was the damn plugs all along, as I thought car dying on boost was boost related, so replaced all vacuum tubing, dv o-rings and was thinking charge pipe next. Now after new plugs no problems on WOT.

Well my plugs were brand new when I had my jerking issue, I put band new one's in to fix a misfire with the new tune and the miss was gone but the jerk was now present at wot redline.

[litxus]

Originally Posted by MJ80.

Well my plugs were brand new when I had my jerking issue, I put band new one's in to fix a misfire with the new tune and the miss was gone but the jerk was now present at wot redline.

My original issue is gone, but now when car is cold I feel a slight miss, therefore most likely one of the coils is going as plugs are brand new, but of course no codes yet. Just checking if you replaced coils, even though I only replace the ones that go bad.

[MJ80.]

Didnt replace coils, the misfire didn't follow when we swapped the coils around, they are still good.

[litxus]

Originally Posted by MJ80.

Didnt replace coils, the misfire didn't follow when we swapped the coils around, they are still good.

In my case I had no misfires at all, only on WOT or some heavy foot. I had no misfire codes or anything like that, but after replacing spark plugs all went away. The worst part is that failing parts do not trigger codes until they completely fail in some cases. Even my coil took about 10k miles to completely fail.

How many miles do you have on the plugs? I heard depending on your mods it might not last too long at all. In my case plugs had about 25k and after a tune it failed after another 5k.

[David1]

Originally Posted by litxus

My original issue is gone, but now when car is cold I feel a slight miss, therefore most likely one of the coils is going as plugs are brand new, but of course no codes yet. Just checking if you replaced coils, even though I only replace the ones that go bad.

Injector

[litxus]

Originally Posted by David1

Injector

Crap, I really do not look forward to this one as it is like $1200 for parts alone, even if DIY is easy. Actually looks more like $923 with shipping from ECS tuning.

May I ask how do you know? I'm guessing you had same symptoms before?