problems after timing belt replacement - Toyota Tundra Forums : Tundra Solutions Forum

bullstundra · #1 (**permalink**) 03-30-2006, 10:09 PM

I have had a rough idle problem after having my timing belt changed. Ive replaced my spark plugs,fuel injectors cleaned, mass air flow sensor repalced,new o2 sensors,and ecu has been reprogrammed by toyota and i still have a rough idle. Its Idles worse once its been running for awhile. Also ive noticed that when i go to pass someone (3500 rpm and higher) the engine has a much higher pitch than it did before the timing belt change. A Toyota mechanic has checked to make sure that the timing belt was properly installed. He said that everything looked ok. Ive asked them to check the valves to see if they need to be adjusted but they seem to think thats a waste of time. Does anyone have any suggestions. Thanks

sevenpedaler · #2 (**permalink**) 03-31-2006, 05:26 AM

It sounds like it could be something as simple as a vacuum leak. That "higher pitch" makes me think that.

42GAMI · #3 (**permalink**) 03-31-2006, 05:43 AM

time to bust out that water spray bottle and look for vac leaks.

MEvang · #4 (**permalink**) 03-31-2006, 06:31 AM

If it was find before they change the belt, they have one of the cams off a tooth. This is the exact symptom of a cam off. Take it to an independent garage and have them check the cam timing.
Mike

bullstundra · #5 (**permalink**) 04-02-2006, 09:41 PM

thanks for your suggestions. A Toyota mech. did check the timing belt to make sure that one of the cams was not off a tooth. He said it looked fine to him.Would you have to take the belt off to do that? I know he didnt take it off.
My truck definitely runs rougher at idle when its been running for awhile. Im wondering if this has something to do with my radiator that had to be repaired because of a small puncture. There are no leaks, but my temp gauge will sometimes rise up to about the half way mark. I cant remember but i think it used to only go up about a 1/4 of the way. could this cause a rough idle as well as a vacuum leak?

capacar · #6 (**permalink**) 04-02-2006, 09:49 PM

hpoe they didnt bend a valve its a interferince motor if you dont do it correctly it could defintly bend a valve

yspert · #7 (**permalink**) 04-03-2006, 03:57 PM

the timing belt is off a tooth on the crank pulley. also, both engines in the 00 tundra are "non-interference" engines. yspert

v8Toilet · #8 (**permalink**) 04-03-2006, 04:51 PM

A leaking or bent exhaust valve will cause a piece of paper that is placed against the exhaust tip to be sucked in rhythmically every time the offending cylinder goes through its cycle at idle.

geojim · #9 (**permalink**) 04-03-2006, 05:54 PM

Quote:

Originally Posted by bullstundra

thanks for your suggestions. A Toyota mech. did check the timing belt to make sure that one of the cams was not off a tooth. He said it looked fine to him.Would you have to take the belt off to do that? I know he didnt take it off.
My truck definitely runs rougher at idle when its been running for awhile. Im wondering if this has something to do with my radiator that had to be repaired because of a small puncture. There are no leaks, but my temp gauge will sometimes rise up to about the half way mark. I cant remember but i think it used to only go up about a 1/4 of the way. could this cause a rough idle as well as a vacuum leak?

Like others state, sounds like a cam timing issue. They can be pretty tricky to get right as the cams want to 'find' a slightly new position once the belt is removed. As far as checking it, I know they would not need to remove the belt, by will need to remove the covers. Kind of a pain, I would imagine. The fact that this is a new symtom since the belt change would lead me to believe this, or possibly they disturbed one of the vacuum hoses near the front.

tempetom · #10 (**permalink**) 04-03-2006, 08:49 PM

geojim wrote
Like others state, sounds like a cam timing issue. They can be pretty tricky to get right as the cams want to 'find' a slightly new position once the belt is removed. As far as checking it, I know they would not need to remove the belt, by will need to remove the covers. Kind of a pain, I would imagine. The fact that this is a new symtom since the belt change would lead me to believe this, or possibly they disturbed one of the vacuum hoses near the front.

I'd bet the belt's off a bit too. From my experience, vacuum leaks are usually felt at idle and pretty much go away at higher rpms. At least that's how my 76 Blazer acted.

From an earler post, weren't all the V-8 Tundras interference engines? I don't know though, but it seems logical that it's the same basic engine.

bullstundra · #11 (**permalink**) 04-04-2006, 09:00 PM

thanks for your advice. Will it be a difficult job to locate and fix the tooth thats not on the crank pulley? Should I let Toyota fix this or should I go back to the Master mechanic who replaced my belt. He has a good reputation but Im not sure how much he knows about Toyota's.