Misfire questions

[TexasXC]

https://www.youtube.com/watch?v=Ro_X...e_gdata_player

What do we think? I think this could be starving it - I have random misfire on #1 and #2 and "general mifire." I think the range for this pressure is 95-105 psi...clearly not it.

[Aviator]

The fuel pressure is exactly where it's supposed to be. Spec is 375-395 kPa. Have you checked the ground wires at the top of the cam cover where your coil harnesses run? Make sure they are tight. You've got random and specific misfire codes happening. I'd be taking a close look at all the wiring running up to the coils, and also down around the ECM. You'd be far better off running this into the dealer and have it properly diagnosed with VIDA. Right now everything is a crap shoot for you. I don't know what your time is worth, but you've spent quite a bit on this issue without gain.

Dave.

[TexasXC]

Is it worth checking the compression across all cylinders?

[TexasXC]

I checked those grounds and inspected/jiggled those harnesses - nothing. Where exactly is the ECM located in the car?

Two reasons I am trying to rule out as much as possible - #1 - I have been chasing this for a bit so there's part of the "thrill of the hunt" and #2 - I am financially drained right now. Just got through divorce and a job change. :-(

[TexasXC]

Also, I was thinking about introducing Seafoam into the manifold somehow - kinda like a variation of the "water torture" method for the old B230s - can I pour 6-8 oz. into the vaccum hose connected to the orange plugged sensor in front of the airbox without also having Seafoam get sucked into the TB due to that Y-splitter? I just don't to want to mess up any parts trying to clean the injectiors...

[JRL]

I'm sorry but if you don't know where the TB is you should take it to a shop, seriously.

[Astro14]

How would pouring seafoam down the intake have any effect on the injectors???

If you want to clean the injectors, use an injector cleaner - Techron is the best, though there are other good ones from Redline and Amsoil. I use one can every oil change (7,500 miles) to keep things clean.

Half the stuff you find in an autoparts store is worthless, save your money and don't believe what the kid at the counter says...

But I doubt that any chemical treatment will fix your misfire.

[TexasXC]

I'm sorry but if you don't know where the TB is you should take it to a shop, seriously.

I know where the TB is - I cleaned it back in October.

I was asking about the location of the ECM so I could trace the harness from the coils back to the main loom and ultimately to the ECM.

How would pouring seafoam down the intake have any effect on the injectors???

If you want to clean the injectors, use an injector cleaner - Techron is the best, though there are other good ones from Redline and Amsoil. I use one can every oil change (7,500 miles) to keep things clean.

Half the stuff you find in an autoparts store is worthless, save your money and don't believe what the kid at the counter says...

But I doubt that any chemical treatment will fix your misfire.

I am really just trying to get Seafoam into the combustion chamber with it running - which is why I mentioned the water torture method.

I was asking about using this vac line into the manifold to get the car to suck in the Seafoam into combustion chamber - just didn't know what kind of backflow/anti-backflow this T-connector would have.


I have always used the Lucas stuff for injector/carb cleaning - it works wonders on a carbed Harley that's been sitting through winter!

At this point, she prob needs to have a thorough Seafoam treatment anyway - even though I am with you about doubting it will seriously fix anything.

I talked to an indy this morning but he is going on vaca for the next 8 days - his professional opinion (26 years as a Volvo tech)- knowing what all has been checked/done/replaced - either a truly dead cylinder (doing compression test immediately after work) or I should replace all 5 coil packs with OE. Said he's never really seen much else cause a misfire on the 2.5 LPT.

I have never failed to chase down and fix any problem on any car, but I am learning new things about this car as I am seriously diving into the systems for the first time - so please just continue to provide knowledge/help/resources - it is very much appreciated.

And as stated before, a trip to a shop isn't financially viable for me at this current time unless something changes here shortly. I am going to exhaust all my resources first.

Thanks guys!

[Astro14]

I haven't tried seafoam on this engine yet - though I've used it many times on the 4 Runner (that gunks up the manifold with carbon from the EGR...so, my objective is manifold cleaning and I know it's dirty...).

That vacuum line will get it into the manifold, but I don't know how well you'll be able to keep the engine running, with ETM, you can't open throttle without stepping on the pedal...hard to do when you're under the hood...

ECM is on the passenger side of the engine, right by coolant reservoir...bit of a PITA to get out though, special tool required.. Not sure where the wires are routed back from the coils.

I haven't done many coils on this, just one, and it was on the T5. I've adopted the "don't fix it until it's broke" philosophy...so far, at 157,000 miles, my XC has had zero coils fail and idles/runs perfectly...

Wish I could be more help.

[TexasXC]

I haven't tried seafoam on this engine yet - though I've used it many times on the 4 Runner (that gunks up the manifold with carbon from the EGR...so, my objective is manifold cleaning and I know it's dirty...).

That vacuum line will get it into the manifold, but I don't know how well you'll be able to keep the engine running, with ETM, you can't open throttle without stepping on the pedal...hard to do when you're under the hood...

ECM is on the passenger side of the engine, right by coolant reservoir...bit of a PITA to get out though, special tool required.. Not sure where the wires are routed back from the coils.

I haven't done many coils on this, just one, and it was on the T5. I've adopted the "don't fix it until it's broke" philosophy...so far, at 157,000 miles, my XC has had zero coils fail and idles/runs perfectly...

Wish I could be more help.

I was either going to stick the hose down into the bottle and have the car drink it while I stood on the pedal OR have a buddy help me by operating the throttle and I would pour it in. Just making sure it isn't going to get sucked into the TB through that splitter.

Special tool required? Tits. Is it under the PS resevoir too?

Hey - besides maintenance, I am RIGHT there with you on the "don't fix it until it 's broke" - I ran rear brakes below tolerance for 13 months - the MINUTE I heard them getting noisy I stopped the car at a buddy's house and did them - less than 1 mile after. Unfortunately, that was this past Tuesday.