Toyota people, please help. Need suggestions...

wazz · Nov 6, 2012

Sounds like a plugged CAT to me. Pull the O2 Sensor or drop the pipe and see if it revs up then.

nwwheeler08 · Nov 6, 2012

wazz said:
Sounds like a plugged CAT to me. Pull the O2 Sensor or drop the pipe and see if it revs up then.

the cat would have to be severely plugged (i.e. no flow at all) to cause something like that. usually with a clogged cat you just have lack of power. With the random dieing/crank no start issue it doesnt really seem like that could be the culprit.

wazz · Nov 6, 2012

Yep it docent happen very often the couple that I fought must have been rattling for some time cause one had a large chunk of the CAT stuck in a bend of the tail pipe (that was fun to fish out of there), and the other (my 84 Toyota truck) went from ran great to it only would idle and foul plugs like someone flipped a switch. On it I found the broken up CAT piece turned side ways at the back of the CAT.

TrikeKid · Nov 6, 2012

Pull the timing cover and check that the marks line up, then do your comp test. Jumped time would get my bet though. Plugged cat is easy enough to check with a vacuum gauge provided the rest of the engine checks out.

cstell · Nov 8, 2012

valves

if you do get to the point where the heads come off check the valves for any blow by and check to see if you have sliped a tooth and the timings gone they are overhead cams

Trevor · Nov 8, 2012

Hmmmm. Brings up another question. Since this is a dual overhead cam motor, if the belt did jump a tooth, is there gonna be bent valves? Is there clearance if it is only one or two teeth? Or do the heads need to come off if I find the belt has jumped?

Dain Bramage · Nov 8, 2012

If the belt jumped, before you go to the trouble of pulling the head, throw a new belt on and see if it runs. You don't have to do a full reassemble, just throw the crank pulley and motor mount back in and try to fire it up.

Eric · Nov 8, 2012

Most toyota motors that have a belt are non interference motors.

If it has a timing chain it is most likely an interference motor.

WA-Wheeler · Nov 8, 2012

Eric said:
Most toyota motors that have a belt are non interference motors.

If it has a timing chain it is most likely an interference motor.

yep, Hondas are ths problem child...

zukkev · Nov 8, 2012

Eric said:
Most toyota motors that have a belt are non interference motors.

If it has a timing chain it is most likely an interference motor.

X2.... Those 2.0L's--->I can't tell you how many broken/stripped belts I've replaced and the motor was fine...

Trevor · Nov 9, 2012

Well, did a compression test. Starting at number 1, it has 150, 130, 150, 130

crash2 · Nov 9, 2012

Compression is good enough to run...

Dain Bramage · Nov 9, 2012

Yup. Check your belt.

Trevor · Nov 9, 2012

If the belt had jumped, wouldn't it have a valve(s) open at the wrong time and give me low compression in one of the cylinders?

Dain Bramage · Nov 9, 2012

Could be those 2 130s. How does it sound when cranking? Smooth, or chunky? How is crank speed?

zukkev · Nov 9, 2012

Typically you will have all 4 holes low (or high) if the belt jumped one way or the other...The two with lower compression are not next to each other, so I wouldn't think there's a head gasket issue...BUT the fact that two are exactly 130, and the other two are exactly 150 does raise question...A cylinder leakdown test is the most surefire way to tell where the compression's going...

Trevor · Nov 9, 2012

Also, checked stored codes via the check engine light. Came up with a 14 which is ignition signal. Wonder if I should be looking at ignitor...

To answer another question that was asked, this thing sounds completely normal and healthy when cranking on it. I have never heard a car crank normal with jumped timing...

I also pulled the o2 sensor out while cranking. Did not get any excess pressure coming out. For now I'm going to assume (and hope) that it isn't a plugged cat.

CHOP SHOP · Nov 9, 2012

With every other cylinder being just a little lower but exactly consistant, couldnt that have somehting to do with the fact that the crank timing is 180 out for every other piston?

A 4 cylinder has the 1 and 3 holes at TDC when the 3 and 4 holes are at BDC.

If the belt was ONE tooth off, could it still make compression in two cylinders that is just a hair higher then the two others since they are paired odd and even cylinders on the crank?

Of course this would be if it jumped on the crank pulley. With overhead cams if it had jumped on one cam it should affect all the exhaust or intake the same and result in consistant readings.

????

Its free to check timing marks.

Its good that its not a head gasket tho or worse. Just more trouble shooting.

CHOP SHOP · Nov 9, 2012

Trevor said:
Also, checked stored codes via the check engine light. Came up with a 14 which is ignition signal. Wonder if I should be looking at ignitor...

To answer another question that was asked, this thing sounds completely normal and healthy when cranking on it. I have never heard a car crank normal with jumped timing...

Ignitor= common failure and can act like you describe.

Good that it sounds normal while cranking.:awesomework: