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#1 Old 12-09-2012, 09:17 PM
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3vz Wont start

So I got this new to me camry that doesn't run. When I turn it over it sounds like the plugs aren't in it. Kinda like a car sounds when your doing a compression test. So I checked the plugs, they look good but got a bunch of fuel on them. So I have fuel. Pulled the upper t-belt cover to check all the marks and for a broken belt-all good. Then I suspected maybe the piston rings have been fuel-washed out causing no compression. So I put a bit of oil in the cylinders and nothing. Then I tried using propane as a dry starting fluid in the pcv hose so as not to wash out the cylinders any more. (Unconventional but its worked for me before)I also loosened up the dizzy and tried moving it around a bit to see if that helps. It almost starts but then I get a backfire out the intake and it blows the afm off the hose!(I had the clamp very loose) I think this is an important key to the mystery. Any ideas out their?
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#2 Old 12-10-2012, 09:48 AM
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I'm thinking the timing belt has slipped a tooth or more. That would explain the easy-cranking, the no start, and the backfire with propane.

1992 Camry LE, V6 (3VZ-FE), ABS brakes, dark emerald pearl, owned since new. Replaced HGs @332k, now at 365k miles
1996 Avalon XLS, ABS brakes, super white II, acquired w/ 139k, now at 308k
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#3 Old 12-10-2012, 11:06 AM
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Hmm. The easy cranking would rule out anything ignition related. The last guy that owned it said he went to start it one day and it wouldn't start. So it sounds like it was something that happened maybe when he tried to start it. Thats a good point I should not ignore. I have not removed the crank pulley. Maybe I should and make sure everything is exact.
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#4 Old 12-10-2012, 01:24 PM
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Yes, does read like the intake valve was still open when when propane ignited, spark plug fired, raw gas wouldn't ignite without a bit of compression(heat).

And with reported lack of compression, cams and crank out of sync would be my guess as well.
Tensoner may need to be replaced if not the whole belt and seals.

Last edited by RonR; 12-10-2012 at 01:33 PM.
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#5 Old 12-10-2012, 02:46 PM
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Quote:
Originally Posted by White Stripe View Post
I have not removed the crank pulley. Maybe I should and make sure everything is exact.
No need to remove the crank pulley. Just line up the pulley's ignition timing mark to "zero"; that'll put cylinder #1 at TDC. Then eyeball the marks on the cam pulleys to see if they're lined up correctly with the witness marks. You do need to remove the timing belt cover for that. And a mirror is almost required to get a good look at the rear bank's pulley.

edit: If none of the pulley marks are even close to lining up, you might need to rotate the crankshaft another full turn.

1992 Camry LE, V6 (3VZ-FE), ABS brakes, dark emerald pearl, owned since new. Replaced HGs @332k, now at 365k miles
1996 Avalon XLS, ABS brakes, super white II, acquired w/ 139k, now at 308k
2001 Yamaha FZ1, Ivan's jet kit, resprung, Ohlins rear shock, Race Tech cartridge emulators in forks, 49k

Last edited by BMR; 12-10-2012 at 03:04 PM.
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#6 Old 12-10-2012, 06:29 PM
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Thanks for the advice. I will check it very carefully. I understand the theory and all, but it just blows my mind that a toyota would jump timing. The belt seemed like it was in good shape when I pulled the upper cover off. Have you seen one jump even with a good belt? Has anyone had something similar ever happen to their V6???

Last edited by White Stripe; 12-10-2012 at 06:31 PM.
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#7 Old 12-10-2012, 08:27 PM
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It seems to be somewhat rare for the V6's to have the timing belt jump a tooth. They both (3VZ & 1MZ) have a hydraulic tensioner to maintain tension on the belt as it stretches. It's sorta like the gas-charged hood lifts; permanently sealed pressure charge. But if it loses its charge, poof, no more tension. But like I said, it's rare.

1992 Camry LE, V6 (3VZ-FE), ABS brakes, dark emerald pearl, owned since new. Replaced HGs @332k, now at 365k miles
1996 Avalon XLS, ABS brakes, super white II, acquired w/ 139k, now at 308k
2001 Yamaha FZ1, Ivan's jet kit, resprung, Ohlins rear shock, Race Tech cartridge emulators in forks, 49k
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#8 Old 12-10-2012, 10:24 PM
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It does seem odd, and for it to have limited or no compression it would have to be the Crank gear that skipped.
If only one cam gear skipped you would still have compression on one bank of cylinders.

What could of happen is the woodruff key for the crank gear failed and gear itself slipped.
Timing belt could still look good and be tight.
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#9 Old 12-11-2012, 06:00 AM
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Ya that makes total sense both about the tensioner and the woodruff key. Ive never seen a woodruff key fail personally but I have a cheap puller and it wouldnt take long to take the pulley off to check it...
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#10 Old 12-11-2012, 09:47 AM
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If the belt was in good shape then whoever did the belt the last time may have F'ed up when reassembling or didn't notice a worn gear or key.

There is a picture in this thread that shows a Toyota V6 with sheared off gear key
http://www.toyota-4runner.org/3rd-ge...t-damaged.html


But not a lot of other posts about this. so seems pretty rare if that's what it is

Last edited by RonR; 12-11-2012 at 09:58 AM.
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#11 Old 12-17-2012, 05:02 PM
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Well I figured out why my Camry isn't starting. I pulled the intake off and looked down the tubes. It turns out 5 of 6 cylinders has the intake valves stuck open! Totally sucks. Anyway I gotta take the heads of and clean the valves. They musta got gummed up since the car has sat for 2 years. I guess I can do a pnp and paint the intake and valve covers on the up side! I will post a pic soon.
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#12 Old 12-17-2012, 06:39 PM
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Put new head gaskets on if your going that far.


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#13 Old 12-17-2012, 07:57 PM
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Quote:
Originally Posted by White Stripe View Post
Well I figured out why my Camry isn't starting. I pulled the intake off and looked down the tubes. It turns out 5 of 6 cylinders has the intake valves stuck open! Totally sucks. Anyway I gotta take the heads of and clean the valves. They musta got gummed up since the car has sat for 2 years. I guess I can do a pnp and paint the intake and valve covers on the up side! I will post a pic soon.
Wow! That's an odd one. Love to see the pics. BTW, when you pull the heads, there is no doubt you'll have to replace the head gaskets. Mine were shredded when I separated the heads from the block. The gaskets stuck to both surfaces and totally delaminated.

1992 Camry LE, V6 (3VZ-FE), ABS brakes, dark emerald pearl, owned since new. Replaced HGs @332k, now at 365k miles
1996 Avalon XLS, ABS brakes, super white II, acquired w/ 139k, now at 308k
2001 Yamaha FZ1, Ivan's jet kit, resprung, Ohlins rear shock, Race Tech cartridge emulators in forks, 49k
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#14 Old 12-17-2012, 08:39 PM
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Yes, odd indeed.
Valves can get bent and stick open, interference engine, 3vz isn't one
Intake valves can "tulip" if they get real hot, lots of pinging precedes that.
Busted springs maybe, but all the intake valves???

I can't see sitting for 2 years would be the cause, why it was put away for 2 years maybe

Maybe cams are not turning at all.

Last edited by RonR; 12-17-2012 at 08:41 PM.
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#15 Old 12-18-2012, 11:35 AM
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Ya I am doing head gaskets and valve seals. I will take the heads off tonight and take em all apart and check it out. It sat for 2 years bcuz the lady was really sick and eventually died. Car only has 57k on it. Will soon find out what is up...
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