No Spark or firing

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supraguy31

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May 10, 2005
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Hey all.

Have a Question for you 7MGTE gurus and I know you can help me here.....

At this time, I have 3 7MGTE converted MK2 sitting here at my place. 2 of them run or have ran fine.. One of them, we have never been able to get it to spark or fire... This is what I found out today....

When we set the Crank on 0 degrees, and made sure the # 1 Piston was on top dead center. I removed the Cam Gear cover to insure that the Timing marks were set correctly, Everything is set as the other 2 cars I have.

Now, When I removed the oil cap and looked down into it at the # 1 cam Lobe. I noticed that on my 2 Running 7MGTE supra that the cam lobe tip is just barely seen, (Just to the left ) On his car, I removed the oil cap and I noticed that his # 1 cam lobe tip is almost at the 2:30 Position. Im assuming that this is telling me that his cams are off somehow.

When I called him up, He told me that his Head came from a 7MGE engine because the original 7MGTE head had alot of Stress Fractures in it.

My Question to you is
1. Can you correct the cams so the the lobe is in the correct Place.
2. Would him having a 7MGE Head on a 7MGTE engine cause any of this Problem.
3. Anything else that I can check would be greatly Appreciated.

Robert
 
shaeff

shaeff

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easy check:

look in the driver's side kick panel. there's a 7.5A IGN (ignition) fuse in there. after my swap, i had no spark and the car wouldnt even try to start. replaced that fuse (no idea how it blew?) and it fired up first try.

-shaeff
 
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supraguy31

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May 10, 2005
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Ok, Now I have a Good Question for you... We just pulled the Valve covers off all 3 of the cars. At TDC The Intake cam lobe is Pointing at the 11:00 Position and the Exhaust Lobe is Pointing at the 2:00 Position on the running cars.

Now on the Non running Engine. its just the Oppisite. The intake lobe is Pointing to the 2:00 Position and the Exhaust lobe is pointing to the 11:00 Position...

Can or could he(the Builder) installed the cams on the wrong sides or are the cams the same. will this Prevent Sparking or firing at all.

Let me know please

So close but so far away

Robert
 
shaeff

shaeff

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hmm... check the cam gears. are the pins in the cams set in the center holes in the cam gears? if not, that's how they should be, so take off the gears (just that one center bolt on each) and put them in the centers. there's no way that the intake cam would work on the exhaust side, as there's no gear for the CPS/distributor on the intake cam.

my bet is that the cam gears are on wrong, thus totally screwing with your timing...

-shaeff
 
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supraguy31

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May 10, 2005
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Im thinking thats the Problem also. The head that he has came off a 7MGE so Im thinking that the Builder was thinking that this car was going to be a 7MGE engine. If that is the case, Then I have a set of 7MGTE cams here that I think I should just Switch out. If that is the case then almost a Year of downtime and work wasted because the Builder had no Idea of what he was doing.

The Cam gears are in the Correct Positions. The Pin is in the center Holes on the Cams.
Robert
 
supra90turbo

supra90turbo

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did the balancer slip? As IJ mentioned, it is a possibility, and easier to find out than if the cams are wrong...
 
shaeff

shaeff

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supraguy31 said:
Im thinking thats the Problem also. The head that he has came off a 7MGE so Im thinking that the Builder was thinking that this car was going to be a 7MGE engine. If that is the case, Then I have a set of 7MGTE cams here that I think I should just Switch out. If that is the case then almost a Year of downtime and work wasted because the Builder had no Idea of what he was doing.

The Cam gears are in the Correct Positions. The Pin is in the center Holes on the Cams.
Robert
Click to expand...

it wouldnt matter if the builder thought it was for a GTE motor, as the heads are the same anyway, and the cams are almost the same (only the intake cam differs from the turbos). the cams wouldnt cause your problem. dont switch out the cams. if the cam gears are in the correct positions, pins in center holes, and the CPS is installed correctly, then chances are that your balancer slipped, like IJ mentioned, as well as supra90turbo...

check that shizzle!

-shaeff
 
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IJ.

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Pull #1 plug grab a piece of small diameter fuel hose that's a loose fit in the plug hole,(about a foot long) turn the crank and watch the hose rise making note of where it stops and and just before it starts back down this is TDC then compare the notch on the balancer.
 
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supraguy31

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We shined a Flash light down into the # 1 Spark Plug well and watch the piston Come up to the top. The Balancer hasnt slipped. Im thinking that the cam with the drive gear from the CPS is on the wrong side. Easy way to check and ensure thats is or isnt the case. Wont take too long for it.

This has been a problem with no spark on this car for almost 10 months now. The owner of the car has replaced almost everything that he could think off. CPS, TPS, Ignitors, Coil Packs, 2 Wiring Harnesses, and 3 ECUs. Still no Difference in anything.

Robert
 
shaeff

shaeff

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IJ. said:
Does the CPS actually turn?

Only 1 cam has a gear
Click to expand...

did you check the fuse as i stated earlier?

and Ian means that only one cam has the drive gear for the CPS/distributor, which i also stated already. ;)

-shaeff
 
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supraguy31

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May 10, 2005
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Pembroke, NC
I havent checked to see if the CPS is actually turning. Im getting ready to go home and see if it is. Its just funny that on my 2 7MGTE turbo MK2s, The intake cam gear is aligned with the timing marks, The pin is in the center hole and the Crank is at 0, Piston is TDC.... The Intake lobe is at 11:00, His car with all the same Settings, His Intake cam Lobe is sitting at the 2:00 Position which is telling me that either the cams are wrong or the Builder installed them backwards by Mistake. He had 4 Motors being built at the same time. I bought 2 of the motors and the other one is the one we are having Problems now. Mine had no Problems firing up once Installed.

Robert
 
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supraguy31

New Member
May 10, 2005
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Pembroke, NC
Ok all, Here we go. I decide to Operate on his car this afternoon and here is the Problem as I can see....

Someone tell me what you see wrong with this Picture:nono: :nono: :nono:
sm_photo_missing.jpg


Dam Cam Gear are in Backwards. Question now is since i have to remove both cams, Is it hard to get the Specs back correct and the Shims.

Robert
 
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supraguy31

New Member
May 10, 2005
626
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Pembroke, NC
Ok, Since we have found the Porblem with this car (10 Month Headache), Im a Little confused on the shim thing.... I know that I have to remove the cams and switch them around but Exactly what do I have to do to the shims to make sure they are correct also. Im assuming that I have to ensure clearances are good also.

Any Idea on a readup somewhere in the TSRM so I can do this right the first time.

Robert
 
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