timing problem with knock

robertsws · 09-04-2009, 03:01 PM

Ok so I just replaced my HG and it wouldn't start, double checked everything aligned right and tried it again, started right up. My problem is that now I have a really bad "repeating pinging" at my #5 cylinder that can be heard on both my intake and exhaust valve covers. I've just done my valve clearances so that is not the problem. Also my timing is WAY off. So far off that I can't adjust it enough to bring it back into specs. I was told that the fact that it is out of timing could cause the pinging. I am at a loss as to why my timing is so far off. What am I missing? My engine is a 7m-gte. I aligned my crankshaft at 0, camshafts with the notches on my timing plate #2, and the hole with the groove on my CPS. Short of a BHG I had none of these problems before. I did neglect to mark position on my gears, CPS, and timing belt before removing everything though. I have done another HG on an 88 non turbo, marking everything, and It took me 10 hours total with no lasting problems. I've been messing with my 91 turbo for months.

robertsws · 09-04-2009, 03:40 PM

OK, so I took out the CPS, spun the sprocket around one whole turn, until the hole lined up with the groove again, re-installed it and checked timing. I was now able to time it to spec. So timing is not an issue anymore. However I still have that steady repeating pinging that increases with RPM. Only now I'm not sure if it's really coming from my #5 cylinder. It certainly sounds louder and clearer over my #5 cylinder, however I can hear it on any metal suface of the engine, including the turbo. I'm going to re-check my valve clearances next.

09-04-2009, 03:01 PM	#1
robertsws 3" Exhaust Join Date: May 2008 Location: Gaithersburg, Maryland Posts: 63	timing problem with knock Ok so I just replaced my HG and it wouldn't start, double checked everything aligned right and tried it again, started right up. My problem is that now I have a really bad "repeating pinging" at my #5 cylinder that can be heard on both my intake and exhaust valve covers. I've just done my valve clearances so that is not the problem. Also my timing is WAY off. So far off that I can't adjust it enough to bring it back into specs. I was told that the fact that it is out of timing could cause the pinging. I am at a loss as to why my timing is so far off. What am I missing? My engine is a 7m-gte. I aligned my crankshaft at 0, camshafts with the notches on my timing plate #2, and the hole with the groove on my CPS. Short of a BHG I had none of these problems before. I did neglect to mark position on my gears, CPS, and timing belt before removing everything though. I have done another HG on an 88 non turbo, marking everything, and It took me 10 hours total with no lasting problems. I've been messing with my 91 turbo for months. __________________ 1991 Supra - Turbo - 5spd 60-1 upgraded turbo Lexus AFM 3" exhaust, 4" tip SAFC 2 550cc injectors (2 sets, venom direct fit, RC engineering) 2.5" intercooler and piping Aluminum radiator w/dual electric fans ARP bolts w/MHG Full-auto turbo timer Fidanza Flywheel & Stage 2 Clutch spark plugs and wires. power steering pump cold temp start switch engine top end rebuilt transmission opened up and inspected at a tranny shop when the flywheel and clutch installed last week.

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
speed sensor problem	nadircicek	Non-Generation Specific Questions	8	10-09-2009 05:58 PM
Timing question	Kevin	MKIII Supra	3	07-10-2009 07:52 PM
Timing problem	mc_p0pe	MKIII Supra	1	07-03-2008 06:36 PM
Starting isssues and spark knock Q's	spudz29212MKIII	MKIII Supra	65	05-30-2008 06:44 PM
Timing problem	f00g00	MKIII Supra	2	03-13-2006 08:24 PM

09-04-2009, 03:40 PM	#2
robertsws 3" Exhaust Join Date: May 2008 Location: Gaithersburg, Maryland Posts: 63	OK, so I took out the CPS, spun the sprocket around one whole turn, until the hole lined up with the groove again, re-installed it and checked timing. I was now able to time it to spec. So timing is not an issue anymore. However I still have that steady repeating pinging that increases with RPM. Only now I'm not sure if it's really coming from my #5 cylinder. It certainly sounds louder and clearer over my #5 cylinder, however I can hear it on any metal suface of the engine, including the turbo. I'm going to re-check my valve clearances next. __________________ 1991 Supra - Turbo - 5spd 60-1 upgraded turbo Lexus AFM 3" exhaust, 4" tip SAFC 2 550cc injectors (2 sets, venom direct fit, RC engineering) 2.5" intercooler and piping Aluminum radiator w/dual electric fans ARP bolts w/MHG Full-auto turbo timer Fidanza Flywheel & Stage 2 Clutch spark plugs and wires. power steering pump cold temp start switch engine top end rebuilt transmission opened up and inspected at a tranny shop when the flywheel and clutch installed last week.