00 Sienna Misfiring

Noticing the engine light on, I took my sienna to autozone for
diagnosis. They informed me that there were multiple engine misfires
and to change the plugs. I changed cylinders 2,4,6,and 5...but am
having a hard time with 1 & 3 as they are against the firewall under
the intakes. Any suggestions to get to them?

Chris

<cshort@brownelevator.com> wrote in message
news:1133988180.610001.135350@g44g2000cwa.googlegroups.com...[color=blue]
> Noticing the engine light on, I took my sienna to autozone for
> diagnosis. They informed me that there were multiple engine misfires
> and to change the plugs. I changed cylinders 2,4,6,and 5...but am
> having a hard time with 1 & 3 as they are against the firewall under
> the intakes. Any suggestions to get to them?
>
> Chris
>[/color]
Can you reach them from underneath the vehicle!
--
Ray O
correct the return address punctuation to reply

[email]cshort@brownelevator.com[/email] wrote:[color=blue]
> Noticing the engine light on, I took my sienna to autozone for
> diagnosis. They informed me that there were multiple engine misfires
> and to change the plugs. I changed cylinders 2,4,6,and 5...but am
> having a hard time with 1 & 3 as they are against the firewall under
> the intakes. Any suggestions to get to them?[/color]

Dealer.

Gary Eickmeier

Man, dealer nothing!! Way to give up there, Gary!! Anyone with a basic set
of hand tools can change freakin spark plugs. It's not like he's changing
out an inverter on a Prius for Christ sake!
Anyway, pull the pcv hose out of the way and disconnect the 12mm bolt
securing a ground strap to the right side of the intake manifold surge
tank. Then you can get a 3" extension with a sparkplug socket under the
manifold and into the plug tubes. Snake a ratchet in there, and you're
good to go. It's a pain in the ass, but it's doable. Post if you need
more help.
"Dealer"....... sheesh.

qslim wrote:
[color=blue]
> Man, dealer nothing!! Way to give up there, Gary!! Anyone with a basic set
> of hand tools can change freakin spark plugs. It's not like he's changing
> out an inverter on a Prius for Christ sake!
> Anyway, pull the pcv hose out of the way and disconnect the 12mm bolt
> securing a ground strap to the right side of the intake manifold surge
> tank. Then you can get a 3" extension with a sparkplug socket under the
> manifold and into the plug tubes. Snake a ratchet in there, and you're
> good to go. It's a pain in the ass, but it's doable. Post if you need
> more help.
> "Dealer"....... sheesh.[/color]

Dealer.

Gary Eickmeier

Thanks for the advice. I got the #1 out last night leaving just the #3
plug unchanged. The van is running rough still, but the Autozone
computer diag said "multiple engine misfires cylinders 1 and 5.
Knowing that I've changed all the plugs so far and still have the
prob...wires next? Or coils?


Gary Eickmeier wrote:[color=blue]
> qslim wrote:
>[color=green]
> > Man, dealer nothing!! Way to give up there, Gary!! Anyone with a basic set
> > of hand tools can change freakin spark plugs. It's not like he's changing
> > out an inverter on a Prius for Christ sake!
> > Anyway, pull the pcv hose out of the way and disconnect the 12mm bolt
> > securing a ground strap to the right side of the intake manifold surge
> > tank. Then you can get a 3" extension with a sparkplug socket under the
> > manifold and into the plug tubes. Snake a ratchet in there, and you're
> > good to go. It's a pain in the ass, but it's doable. Post if you need
> > more help.
> > "Dealer"....... sheesh.[/color]
>
> Dealer.
>
> Gary Eickmeier[/color]

You don't have spark plug wires (in the traditional sense). It's either
the plugs, coil packs or could even be a faulty fuel injector. What
plugs did you use as replacements?

Nirav

You know what, there is a TSB involving coil replacement for the 1MZ-FE in
some Camrys and Solaras the display a misfire code. I do not remember if
the Sienna is involved. But in the meantime what you can do is switch your
coils around and see if the misfire moves with them. Your van should only
have coils on the front bank, which are cylinders 2, 4, and 6, with plug
wires going from each coil to cylinders 1, 3, and 5. Changing the coild is
real easy, just pop the 10mm bolt securing the coil, unplug the connector
and pull it out. If you shuffle things around and the same codes persist,
you don't have a coil problem. I'll check that TSB tomorrow. I'm curious
now.

I changed all the plugs still ruinning rough. Last Autozone diag was
cylinder misfires cylinder #3, changed plug, all new now...if cylinder
3 is still bad, gonna change the wires, coil last

Ok, all new plugs, new wires. Running now like its choked, but
smoother than before. Check engine light is now blinking. Any ideas?

cshort wrote:
[color=blue]
> Ok, all new plugs, new wires. Running now like its choked, but
> smoother than before. Check engine light is now blinking. Any ideas?[/color]

Are the new plugs and wires OEM or aftermarket? If they are aftermarket,
performance will tend to suffer.

aftermarket, but even when I change back to original wires and plugs,
still runs the same. Autozone said that the diag tool will read the
same problem until there have been 50 starts to clear the computer.
Anyway to clear it sooner to get a more accurate reading?

cshort wrote:
[color=blue]
> aftermarket, but even when I change back to original wires and plugs,
> still runs the same. Autozone said that the diag tool will read the
> same problem until there have been 50 starts to clear the computer.
> Anyway to clear it sooner to get a more accurate reading?[/color]

Original, as in what the van had when you bought it? If so, they were
probably due for replacement.

To put it another way, get new OEM plugs. The original wires, however,
may still be OK.

It had Denso's in it, I replaced them with Bosch...are you suggesting
that even though I changed plugs and wires, its still running rough
cause of those new plugs? Anything else I should be looking for? I
don't think coils are bad.

**Update** Installed all new plugs and wires. Engine check light is
still on, blinks at steady higher rpms. Running almost like its
choked, but is driveable. Any suggestions where to go next?