Timing problem

J

jonahs_supra

Active Member
May 17, 2011
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Lancaster, Ohio, United States
jdmfreak;1908720 said:
Same thing these guys said

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lol rotate til spark plug is at highest point. wtf was i thinking
brain fart. ment #1 piston

to help clarify
20+ yrs of use, heat cycles, etc....can cause rubber inside crank pulley to harden and loosen up from crank pulley
these engines use a dampening crank pulley
pretty much its a 3 piece pulley system, center section(steel, where crank pulley bolt goes through), middle rubbber section(dampening material thats drys/loses grip) and the outer steel piece with ribs(where the serpentine belts ride)
the timing marks are on the outer piece with ribs, with the drag of the accessories(alt, a/c, p/s, waterpump) and age of rubber it doesnt take much for the outer section to slip and rotate around. thus making your previously perfect timing marks(when new) out of adjustment

i know on my 91 with 80k miles my outer section was off a 1/4"
reason why its was suggest to remove #1 spark plug, place wooden dowel inside cylinder #1, rotate engine until wooden dowl is at its highest point(make sure your on correct stroke)
normally the pulley wont rotate to much so simply looking down and see if your notch on crank pulley is close to timing mark on timing cover is close will let you know if your on correct stroke
once you have verified your #1 cylinder is at TDC(top dead center) then begin cps install
 
S

Spoolncruzn

New Member
Jan 12, 2013
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newport news va
ok i will do tommrow when i get off work and come back with update and also i had a smoking problem after i did the valve seal it didnt smoke for awhile car also has a brand new turbo with 700 miles well i cleaned out all my ic piping and ic cuz there was old oil from previse bad valve seals and it didnt smoke for a day and now its back im thinking i didnt know it had a brand new turbo when i first got the car so i drove the hell out of it coulde i have blown the seals not giving it a good brake n?
 
3p141592654

3p141592654

90T
Oct 11, 2005
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Thousand Oaks, CA
Spoolncruzn;1908777 said:
ok and how do i fix code 51 the link is this same page?
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The link was to your post where you said you had a code 51. Everyone seems to be convinced the crank pulley has slipped, but with a code 51 you will not be able to set timing properly. You can find more about code 51 here.
 
S

super51fan

New Member
Jul 28, 2010
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Indianapolis
You wil get a code 51 if your ac switch is on. Check and make sure your ac switch is off. Next is IDL contacts in the TPS. Possible throttle body needs cleaned to allow throttle plate to close all the way. If not the ECU will not see idle contacts. Could also be bad TPS or require a minor adjustment. Another thing to look for and hear is the idle speed change slightly while your are jumping from TE1 to E1 Usually if the idle changes you should have no problem setting timing. Again what is your engine vacuum at idle. You do have a boost/Vacuum gauge. Correct ignition timing will have vacuum at 18-20"" HG at idle. If You rotate the CPS till you achieve the correct vacuum and everthing is in time the bolt for the CPS should be about in the center of adjustment slot. If not you are off a tooth. It is possible the crankpully has outer section has moved. But if you follow this Your timing will be very close even if your crankpulley has slipped.
 
Nick M

Nick M

Black Rifles Matter
Sep 9, 2005
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Nick M

Nick M

Black Rifles Matter
Sep 9, 2005
8,894
38
48
U.S.
www.ebay.com
Spoolncruzn;1908709 said:
yes my 0 mark and the line on crank r good its at tdc when thats lined up and i cant get the cps at 0 when i have the cover off checking it when i slide it in the head iv tryed the hole one click back and everthing
Click to expand...

That is what you do. The teeth are not spur cut. You have to account for the roll with the gear.
 
S

super51fan

New Member
Jul 28, 2010
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Indianapolis
My uncle who is was a Toyota Mater Tech for 15 plus years says if you will listen to my last post you should be good to go. A code 51 is most likely ac switch on. if not idle contacts. I would listen to him.. He has 3 great MKIII supras that run and drive look good. Yes 7MGTE powered cars. A code 51 does not effect the abilty to set timing 99% of the time. I would follow his advise.
 
3p141592654

3p141592654

90T
Oct 11, 2005
3,816
16
38
Thousand Oaks, CA
It is true that A/C on will cause 51 and will not affect base timing.

Based on what I've seen on these forums code 51 is not 99% due to A/C being on, most people are smart enough to figure that out for themselves. Typically, people on this forum posting code 51 and having timing troubles are dealing with an issue with the IDL circuit, and usually the TPS is out of adjustment. Now for the OP here, who knows, he seems to have some sort of protective barrier to good advice.
 
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Spoolncruzn

New Member
Jan 12, 2013
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newport news va
ok so I went to go start my car to runn up to the store and I jumped in turned the key and motor turned over but woudnt start and herd a wried noise popped the hood and found the cranks pulley got a lil loose so I tightend it up nd tried starting it sund went away but no start so I checked for codes came up with 12 51 knock sensor did the crank pulley b n loose mess with it and how coulde it keep my car from starting I made sure the timing belt didn't jump and its all still n line?
 
S

super51fan

New Member
Jul 28, 2010
497
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Indianapolis
I bet the No "ne" is caused by the timing belt crank gear or key way messed up. I bet the timing belt is not turning. Should have heard a knocking noise while running if crank bole was loose. Need to remove and inspect.
 
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