2006 Taco - 1GR-FE - Timing chain/oil leak issue.

2006 Tacoma - V6 4.0 - 175,000miles - frame replacement in fall 2014
I've had the truck since 10k and have done all oil changes with Mobil one synthetic/Toyota filters every 5,000 to 7,500 miles.

Basically last 6 months ago engine was running rough and engine light came on. I took it to a local Toyota dealer and they said the oil was down and the engine light was a result of "Camshaft sensor bank 2 sensor a correlation timing jump, P0018". They did the conventional oil change and the truck was running better. I have since been checking the oil more regularly thinking it is an older truck now and might be burning/leaking a little. I added about 1-2 quarts total of oil in the past 6 months.
Last week the engine light is on again and engine running rough. I put a half quart in and on the way to the dealer again the engine light went off and truck ran smoother. Still dropped off truck to be sure.

Dealer calls me. They say timing chain is stretched and "just replacing the chain could lead to motor failure-recommend engine replacement with used motor" I'm going to talk to another dealership tomorrow night. I've done a little research and I do have the typical oil leakage from the chain tensioner plate area. (I think there is an old TSB) which obviously wouldn't help me.

Am I crazy to look into having just the timing chain and water pump done by a 2nd dealership/mechanic?

 

bump

 

I'm certainly not an expert machinist who specializes in engine rebuilding, but I cannot fathom how replacing the timing chain could cause engine failure.

 

A "used" motor could have or quickly develop the same problem. I'm not expert on this issue, but wonder if there are a number of other issues driving the P0018.

Have you seen this thread:

https://www.tacomaworld.com/threads/crankshaft-position-sensor-replacement-p0018-obd-code.294296/

 

guys,
thanks for input. there is def oil leakage from the supposed weak point (above timing chain sensor access plate) on the seal of this timing chain cover.
just kind of surprised that the seal went so quickly and they didn't notice the leak 6 months ago.

 

Unless there are some other internal issues a timing chain replacement is Not going to cause engine failure. I would get a second opinion.

 

If they think that replacing the timing chains will lead to engine failure, they aren't competent in some fairly basic engine repair. Unless there are other trouble signs with the engine, or suspected oil consumption beyond the leak in the timing cover, it's a ridiculous statement if you ask me. That said, I would consider having the head gaskets done at the same time, since <2007 1GR-FE's have a weak point in the head gasket at #6 cylinder. With already replacing timing chains, you are over 1/2 way there already as far as labour goes. Something to consider anyway. It all depends on how long you plan to keep the truck too I suppose.

 

quick update.
I checked into another larger dealership this evening. he asked if the chain was making noise...I said no. He said then it probably isn't stretched. I have appointment next Monday to get a second opinion and diagnosis.
I'm just kind of disappointed in the first dealership I went to. It looks like the truck might have had issues back then and they didn't say anything. All they did was an oil change and plugs. I paid 600 for a complete tune up and inspection back then (120K service). I guess checking the usual fail areas on the engine isn't included. T-SB-0326-08
Thanks for the input guys. I have a feeling that others are going to be dealing with this in the future.

 

Yeah a dealership "tuneup" is a huge red flag for anyone with minimal mechanical knowledge and basic hand tools. Hell I'm considering fixing my timing chain oil leak myself and I'm no mechanic by any stretch of the imagination.

 

well, its over. After a 4/5 hour tear down they said the timing chain was stretched in a couple places as well as cog teeth being worn and tensioner wear. They said there where no failed gasket/leaks from what they could see.
I had the timing chain, tensioner, pulleys, cogs, dampeners... They replaced a bunch of stuff. I also had purchased oem water pump, tensioner, several pulleys and thermostat several months ago with the intention I putting them in myself. They put all that junk in for me which was cool. I also think they cut me a break on the labor rate from what I can tell. They also covered a rental for 3 days for what it is worth.
I just want to make it clear. Toyota replaced the frame 2 years ago. Since then I have done complete brakes and lines, shocks all around and carrier bearing/u joints my self thus saving a little bit of money. The truck looks great for its age. That is why I went and put the money in it.