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Discussion Starter · #1 ·
I have a 2000 Celica gts. I have a brand new oem head and I also purchased a brand new oem short block from MWR and had the 12.3.1 pistons put in. They put the block fully together then shipped it to me. After having my engine put together and installed I have a deisel knocking sound only when the car is in gear and any % of throttle is given. Sounds fades as less throttle. Does not get louder with more throttle but does however speed up with engine. It's not loud but is noticeable. The car sounds perfect at idel and even raising RPM while in neutral , just makes the sound while in gear with any kinda of load on the engine.

I now have 200 miles on the engine. Valve clearances have been checked and are perfect. oil level is fine. Still running thick GTX 10w 40 during break in.

Wide band reads between 14 and 15 or so during normal driving , 13 during full throttle.
Normal driving LTFT constantly ask for + 25 on even just 10% throttle ( may be more and my computer only reads up to 25 I'm guessing. )
IAF 113
MAF 2.8 to 3.2
Ignition is at 22 to 23 degrees.
93 octane gas
BTW car dives great.
These are some figures that MWR asked for in a attempt to help figure this out. I just haven't talked back with them cause it's the weekend. I'll be calling tomorrow. I also understand MWR is on here so I was hopeing to discuss I case some one else has had the same thing and can help.
Ive had multiple shop mechanics ride and listen and no one can seem to figure it out, some have speculated piston slap but weird it don't do it at idel. Last guy guessed its to lean do to the numbers I posted and MRW is so far saying it could be detonating , but they were needing these figures. I'd be happy to give any of you my phone number to talk about this issue if need be. I would appreciate any feed back.
 

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Discussion Starter · #2 ·
And I would like it to be known. I in no way am trying to talk negative of MRW. I understand they are the only 2zz ge specialist in the country. I have full resect and confidence that if any one is to know what I'm experiencing that it would be the guys at MWR. Thankyou to all that helps as well. I'm glad to have funnily joined this forum. It has always been the best source of info for our cars. Hi there to every one.
 

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check your VVT sproket and your VVT OCV , i had a problem on this new engine i have and eventualy blowed the VVT sprocket and it had that noise after i assembled it


regards
 

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Discussion Starter · #5 ·
Thankyou for the ideas. I have never replaced the sprocket. I have new OCV and after hearing the sound , we haved replaced the strainers in both OCV's. I shall mention that to MWR when I talk to them tomorrow. I did just get back from a test drive where I unplugged the vvt ocv , it still had the same noise I get when applying throttle. So I plugged it back up. I drove around and had my wife hold my OBD2 reader while on Live Data and video the screen so I can look at the readings in case y'all would need any number for any reason. But the socket being bad would make sence to why I only hear the knocking noise only when applying gas. Thanks again for giving advice. I really appreciate it. No one in my town seems to know anything about theses engines.
 

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Discussion Starter · #7 ·
Hi there Smaay. So glad to hear from ya, I've heard good things bout you. I was hopeing you would comment on this issue. I also agree that I'm sure they would have had to know the clearance. Does the vvt sprocket seem to make any sence to you? And any other 2zz ge guys I can talk with please provide info. MWR are all I know of. Im of course cunsulting with them cause I got my block from them. The performance shop I use for everything is very reputable on the gulf coast but don't have much experience with these engine and they admit that. So they are just doing my installs. Anyways. Please Smaay , give any input you believe can help me. This sound seems to kick everyone's butt. Hopeing you , MWR , and some people on here can figure this out. I love my set up and don't really wanna have to give it up to get rid of a noise. Thanks again y'all. Please let me knowmifnthere is ever anything I can do in return.
 

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They are not the only 2zz specialist. D&D Performance is a very reputable and highly respected shop. And they are closer to you than MWR. They are located near Houston, TX.

I would check what you get from MWR. I sent them a head one time to check clearances and install some springs while it was there and it came back with the stock springs. In general as a rule for me I double check every ones work that I don't do myself..
 

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Discussion Starter · #9 ·
Awesome. Thanks man. I will defiantly give them a call after talking with MWR and see if they agree with whatever verdict I receive from them. I've gotten 5 in person opinions over the weekend and only 1 good guess from a very smart engine builder but none of witch have experience with these engines.

I'm defintaly going to keep my progress posted on this site as it unfolds. I haven't seen anywhere else of anyone that has had the exact issue I'm having now. So I'd be glad to pass along the info as I learn it.

Thanks again for telling me about the shop in Texas.
 

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Mobile is quite far from Houston, and he is on the west side of Houston. its about a 8 hour drive. trust me i did it. i drove from El Paso to Eglin AFB in 18 hours.

anyways back on topic, i dont think its the VVT sprocket if its a new OEM head. im still leaning towards the pistons slapping in the cylinders. are they Mahle pistons?
 

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Discussion Starter · #11 ·
Yes they are mahle pistons. I've had a friend say it's slap also. He did the same setup but his was on a old block so ofcourse he was Gunna have slap. But he heard my car and says it sounds a lot like his did. However, mine dont do it at idle nor does it do it reving. It only does it when in gear and the engine has and % of load on it. If you still believe it's piston slap, could you explain why it does for me when it does??
 

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I have a 2000 Celica gts. I have a brand new oem head and I also purchased a brand new oem short block from MWR and had the 12.3.1 pistons put in. They put the block fully together then shipped it to me. After having my engine put together and installed I have a deisel knocking sound only when the car is in gear and any % of throttle is given. Sounds fades as less throttle. Does not get louder with more throttle but does however speed up with engine. It's not loud but is noticeable. The car sounds perfect at idel and even raising RPM while in neutral , just makes the sound while in gear with any kinda of load on the engine.

I now have 200 miles on the engine. Valve clearances have been checked and are perfect. oil level is fine. Still running thick GTX 10w 40 during break in.

Wide band reads between 14 and 15 or so during normal driving , 13 during full throttle.
Normal driving LTFT constantly ask for + 25 on even just 10% throttle ( may be more and my computer only reads up to 25 I'm guessing. )
IAF 113
MAF 2.8 to 3.2
Ignition is at 22 to 23 degrees.
93 octane gas
BTW car dives great.
These are some figures that MWR asked for in a attempt to help figure this out. I just haven't talked back with them cause it's the weekend. I'll be calling tomorrow. I also understand MWR is on here so I was hopeing to discuss I case some one else has had the same thing and can help.
Ive had multiple shop mechanics ride and listen and no one can seem to figure it out, some have speculated piston slap but weird it don't do it at idel. Last guy guessed its to lean do to the numbers I posted and MRW is so far saying it could be detonating , but they were needing these figures. I'd be happy to give any of you my phone number to talk about this issue if need be. I would appreciate any feed back.
Sounds a lot like a small nick in a rod bearing or possibly a missing thrust bearing. Either way it is an internal engine issue. As Smaay said it needs to be torn down and gone through.

Also, you are using the wrong oil - should be 5w30.
 

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my head and block came assembled from the US by MWR , and its also all brand new the only part that i did not replace was the VVT sprocket and the noise was the one described and it blew on me after replacing the sprocket the noise was no more , my engine makes few noises but iam energy suspension engine mounts and the C-one engine damper , and i use 5w40 oil.

you can do a very simple test but power to VVT OCV car at idle and see if it stall´s , if it does not stall the VVT sproket is full of sludge like mine was , this has nothing to do with the locking pin after removing or assembling new cams the VVT sprocket blows becouse of debris inside and crap , new models dont have that problem becouse are build whith more clearance between metal parts


regards
 

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Discussion Starter · #18 ·
QUESTION ,, what do y'all's wide bands read at full throttle? Or what does a stock Celica gts read. As you see that I have the 12.3.1 pistons and my Windband reads 13.2 at full throttle , that seems a big Lean. Any ideas on how to rich it a bit ( I have oem ECU ) I've heard something about "grey injectors". Any thoughts. Thanks for any input.
 
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