2000 Toyota Sienna Car not accelerating

Tiny
CHRIS SALAMONE
  • MEMBER
  • 2000 TOYOTA SIENNA
  • 3.0L
  • V6
  • FWD
  • AUTOMATIC
  • 126,000 MILES
I removed the wiper cowling and the air filter case in an unsuccessful attempt to change the rear spark plugs ( realized I need to remove the intake manifold).
After putting things back together the car starts but will not accelerate until I have spent several minutes revving the car in the driveway. Do you think think I damaged the mass air sensor of did something to throttle?
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Monday, December 2nd, 2013 AT 4:50 PM

7 Replies

Tiny
JACOBANDNICKOLAS
  • EXPERT
Make sure everything is properly attached to the sensors. Once it warms up, does it run okay?
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Monday, December 2nd, 2013 AT 5:36 PM
Tiny
CHRIS SALAMONE
  • MEMBER
It was misfiring for several weeks that is why I tried to change the plugs. I changed out the front 3 and it was running much better, until I tried to change the rear plugs.
I was able to get one rear coil out, but couldn't get the plug out, so I put everything back together until I had time to complete the job. Now it doesn't accelerate at all until it warms up. However even when warm it idles rough, runs very choppy, and will sometimes hesitate when trying to accelerate both on the highway and from a dead stop.
Thanks!
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Tuesday, December 3rd, 2013 AT 8:53 AM
Tiny
JACOBANDNICKOLAS
  • EXPERT
Has the check engine light come on to indicate a misfire? If so, is it one of the cylinders you were working on? This has to be related to what you did and is most likely a simple fix.
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Tuesday, December 3rd, 2013 AT 9:02 AM
Tiny
CHRIS SALAMONE
  • MEMBER
Yes the check engine light did come on and it does seem to be misfiring more than before. Perhaps when I took the back coil wire off, I didn't reattach it properly. I think I need to finish the job of changing the plugs. The coils packs are very expensive on the sienna's, any way to check which ones are misfiring?

Thanks! Big help!
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Tuesday, December 3rd, 2013 AT 11:06 AM
Tiny
JACOBANDNICKOLAS
  • EXPERT
If the check engine light has come on, the codes you get from the computer should indicate which cylinders are misfiring.
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Tuesday, December 3rd, 2013 AT 4:25 PM
Tiny
2CARPROS-ARCHIVES
  • MEMBER
  • 2002 TOYOTA SIENNA
  • 202,000 MILES
My van recenty started losing power when I press on the accelerator. When driving, the speedometer will drop down to 0 then a few seconds later jump up to 50, then fall back down to 0. It is like the van is confused and doesn't know if it is going or not. After losing power, it will all of a sudden accelerate back up to the speed I was going. The ABS light, flat tire light, check engine ight, and brake light are all on. Only the left half of the dash lights are lit. Have already taken in 1 time to be checked. They unplugged and cleaned everything. It helped for a couple of days. This is the second time to take into the shop.
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Thursday, August 1st, 2019 AT 5:44 PM (Merged)
Tiny
DRCRANKNWRENCH
  • EXPERT
Get the trouble codes pulled so you can see what comes up for yourself. Any Advance Auto or Auto Zone will do this for free.
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Thursday, August 1st, 2019 AT 5:44 PM (Merged)

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