2.0L D-4D Misfires At 1800-2000Rpm

[jifl]

I've had an ongoing problem with my 2006 T3-X 2.0l D-4D Avensis, which doesn't seem to quite fit posts here in the past. When the revs are between 1800-2000 RPMs, it judders and misfires a bit. The Toyota dealer thought the EGR valve was coked up. I cleaned it up myself until it was spotless, and I was thinking that did appear to be improve things. But the problem did still seem to be lingering, although at that point I hadn't really pinned it down to the particular rev range.

Since that point, I've also been diligently avoiding supermarket fuel, and regularly putting the revs just below the red line for a little while a few times a week, in order to try and clear any other coked bits. I've also used the BG244 diesel fuel cleaning additive which has been recommended here.

Unlike others who have reported these sorts of problems here before though, MPG and acceleration don't seem to be affected, except in this rev range. In fact the misfiring isn't that bad if I'm accelerating through the 1800-2000 RPM range. But if I'm driving at a constant speed when the revs are in that range then there's just these little judders every few seconds or so. Below and above those revs are fine. I'm wondering if it's actually some sort of EMU problem. I've also read here the turbo is meant to kick in at about 1800RPM, but that wouldn't cause a problem if I was going a constant speed though surely.

Any thoughts? Thanks in advance,

J

[igormus]

I've had an ongoing problem with my 2006 T3-X 2.0l D-4D Avensis, which doesn't seem to quite fit posts here in the past. When the revs are between 1800-2000 RPMs, it judders and misfires a bit. The Toyota dealer thought the EGR valve was coked up. I cleaned it up myself until it was spotless, and I was thinking that did appear to be improve things. But the problem did still seem to be lingering, although at that point I hadn't really pinned it down to the particular rev range.

Since that point, I've also been diligently avoiding supermarket fuel, and regularly putting the revs just below the red line for a little while a few times a week, in order to try and clear any other coked bits. I've also used the BG244 diesel fuel cleaning additive which has been recommended here.

Unlike others who have reported these sorts of problems here before though, MPG and acceleration don't seem to be affected, except in this rev range. In fact the misfiring isn't that bad if I'm accelerating through the 1800-2000 RPM range. But if I'm driving at a constant speed when the revs are in that range then there's just these little judders every few seconds or so. Below and above those revs are fine. I'm wondering if it's actually some sort of EMU problem. I've also read here the turbo is meant to kick in at about 1800RPM, but that wouldn't cause a problem if I was going a constant speed though surely.

Any thoughts? Thanks in advance,

J

do not use supermarket diesel !!!

check with resistance of both SCV, change fuel filter.

regards / Igor

[jifl]

do not use supermarket diesel !!!

check with resistance of both SCV, change fuel filter.

Don't worry, I stopped using supermarket diesel quite some time ago now. Are you really sure the SCV or fuel filter are likely culprits given acceleration is pretty much fine and the only problems are just in that relatively narrow 1800-2000 RPM range?

Cheers,

J

[igormus]

do not use supermarket diesel !!!

check with resistance of both SCV, change fuel filter.

Don't worry, I stopped using supermarket diesel quite some time ago now. Are you really sure the SCV or fuel filter are likely culprits given acceleration is pretty much fine and the only problems are just in that relatively narrow 1800-2000 RPM range?

Cheers,

J

hi

these two items are easy to be inspected . i am inclined to SCV that might be partly opened . but also check with feeding voltage -- if it less that 12V this might also influence on SCV job. you have to exclude possible culprit parts in the problem chain. regards / Igor

[sub77]

I have similar problem, in the rev range 1800 -2000, almost like a blown exhaust kind of sound. Is that the sound of a misfire? The Car feels absolutely fine but the sound is annoying. It comes when in gear or just revving up.

Is there a guide on how to check the SVC.

[sfalcus]

What is the svc?

This just started happening on my t180, exactly as the 1st post describes.

I just cleaned the egr last week and seems to have started since then... Also recently changed fuel filter

[L666 DER]

Hello i had a similar problem driving me nuts. Sounded like a blown exhaust. What i eventually found is that on the air box intake pipe running down the side of the wing, a little plastic spacer lug which rests against the wing was the culprit as it was banging on the wing, the foam padding was worn thin. I removed the pipe and wrapped some foam tape around the lug and built it up a couple of times then refitted the pipe.

Hope this helps.

[Mistermena]

I'm inclined to go with the scv as well. If the fuel filter (And EGR Valve cleaned) has been changed and BG244 run through the system, then I'd look at cleaning the MAF with some electrical contact spray and take a look at the air filter condition...

[sub77]

Hello i had a similar problem driving me nuts. Sounded like a blown exhaust. What i eventually found is that on the air box intake pipe running down the side of the wing, a little plastic spacer lug which rests against the wing was the culprit as it was banging on the wing, the foam padding was worn thin. I removed the pipe and wrapped some foam tape around the lug and built it up a couple of times then refitted the pipe.

Hope this helps.

L666DER, Thank you very much, that was exactly the problem I had, the pipe from the air box was vibrating. Got it sorted and no more blown exhaust sound. If any one is interested

I put the steps in this post http://www.toyotaownersclub.com/forums/index.php?showtopic=138787