Starting isssues and spark knock Q's - Page 7

supramacist · 05-27-2008, 12:46 AM

I had 1 thing go wrong and by the time I finished poking and prodding I have a list now.

It never ever seems to fail.

These cars cover up so well until they break.

blackturbo1 · 05-27-2008, 02:47 PM

OK, my next two cents goes toward a cam follower knock, that is, the knock sounds to me like it's coming from the head, not the block. Although it's not easy to diagnose from a video and because I don't know exactly what yours sounds like, I can't say %100 that this is the cause but if I were to bet, I would say it definately sounds like something in the head.
Since Supra cam followers are solid type and not hydraulic, only two possibilities arise, either there is too much clearence between the cam lobe and the follower or you may have a valve that is slightly sticking. If the valve is sticking you could try some marvel mystery oil. If clearance is the issue, you've either got a worn cam lobe or follower shim or a combination of two.

Of course, I could be totally wrong and you might have a bad piston pin.
In that case, time for a new motor.

spudz29212MKIII · 05-28-2008, 04:43 AM

its in the head, i know that, loudest at exhaust side valve cover

walshy2103 · 05-29-2008, 06:48 PM

Hi, can anybody help me please? ive recently blown up the engine (7MGTE) in my supra and replaced it with an other. Everything is fine apart from i have not got a spark. I broke the reverse speed sensor off the gearbox (have not got a clue what the reverse speed sensor does??) does it have anything to do with the spark? the ignitors should be grand because they were not touched. Could somebody point me in the right direction?? thanks

spudz29212MKIII · 05-30-2008, 04:34 AM

Ran a EFI Diagnosis?

supramacist · 05-30-2008, 06:44 PM

The ignitors should be grand says: you haven't checked them yet.

Please do.

05-27-2008, 02:47 PM	#62
blackturbo1 Stock Join Date: Jan 2008 Location: New Orleans, La Posts: 6	you-tube engine knock OK, my next two cents goes toward a cam follower knock, that is, the knock sounds to me like it's coming from the head, not the block. Although it's not easy to diagnose from a video and because I don't know exactly what yours sounds like, I can't say %100 that this is the cause but if I were to bet, I would say it definately sounds like something in the head. Since Supra cam followers are solid type and not hydraulic, only two possibilities arise, either there is too much clearence between the cam lobe and the follower or you may have a valve that is slightly sticking. If the valve is sticking you could try some marvel mystery oil. If clearance is the issue, you've either got a worn cam lobe or follower shim or a combination of two. Of course, I could be totally wrong and you might have a bad piston pin. In that case, time for a new motor.

05-28-2008, 04:43 AM	#63
spudz29212MKIII 3" Exhaust Join Date: Mar 2008 Location: Columbia, SC Posts: 69	its in the head, i know that, loudest at exhaust side valve cover __________________ Zach

05-29-2008, 06:48 PM	#64
walshy2103 Stock Join Date: Dec 2007 Location: Ireland (South Armagh) Posts: 10	Help Hi, can anybody help me please? ive recently blown up the engine (7MGTE) in my supra and replaced it with an other. Everything is fine apart from i have not got a spark. I broke the reverse speed sensor off the gearbox (have not got a clue what the reverse speed sensor does??) does it have anything to do with the spark? the ignitors should be grand because they were not touched. Could somebody point me in the right direction?? thanks

05-30-2008, 04:34 AM	#65
spudz29212MKIII 3" Exhaust Join Date: Mar 2008 Location: Columbia, SC Posts: 69	Ran a EFI Diagnosis? __________________ Zach

05-27-2008, 12:46 AM	#61
supramacist 1000whp postwhore Join Date: Apr 2007 Location: Escape from the Prison Planet Posts: 1,356	I had 1 thing go wrong and by the time I finished poking and prodding I have a list now. It never ever seems to fail. These cars cover up so well until they break.

05-30-2008, 06:44 PM	#66
supramacist 1000whp postwhore Join Date: Apr 2007 Location: Escape from the Prison Planet Posts: 1,356	The ignitors should be grand says: you haven't checked them yet. Please do.