Exhaust leak behind engine?

CanadianBak'inSupra · 05-18-2010, 03:36 PM

i just heat wrapped my manifold, and my manifold gasket was barly there...
i would start with where manifold reaches exhaust.
also its only like a 1.5$ / foot of the vacuum lines if you think its egr, just buy 10 ft and start 1 vacuum line at a time i replaced every line on mine just because i could for under 30 dollers (it took about 26 feet for my 84 5m-ge)

also i have seen these manifolds crack, check for cracks and make sure the heat shield studs are all tight, because they go strait through to the inside of the manifold

907mge · 05-18-2010, 04:01 PM

Here is a good link about the exh man. studs that i've found as well as some other good info for anyone interested
http://cjsupra.kendra.com/Helicoil.html

turbonicsperformance · 05-19-2010, 03:34 AM

just pull a small vac line and run some atf into it look for the smoke and you've found your leak and gotten a slight decarbon or you could buy some seafoam and do it and get a full decarbon

vbryanv · 05-24-2010, 11:24 PM

sat i blew a freeze out plug from the block and to replace it i had to take the exhaust manifold out. every bolt that came out came out wit threads and the rear 4 bolts where loose cause they where stripped. also from the head and gasket i can tell i had a major exhaust leak from cylinder 4 to 6. sucks now time to heli-coil. i will let you guys know how it comes out after repairs.

Brutus · 05-26-2010, 04:02 PM

The exhaust leak has been fixed.

I had the car in the shop for a week and after $800 it runs poorer than when it went in.

I'm questioning the under drive pulley and the fan. When the fan is set too low, it runs after shut off and kills the battery. If it is set too high, the engine temp fluctuates - and when it gets hot, the a/c doesn't blow cold. As soon as the temp goes back down, cold a/c again. Can anyone explain this?
Maybe the under drive pulley is turning the water pump too slow? Electric water pump?

Also the car has a real problem getting boost and will not go above 7 or 8 lbs. and really struggles to get to higher revs (above 5000 rpm).

At idle it has a stumble about every 5 seconds or so and that stays as the revs climb.

The mechanics checked the entire system for leaks, replaced the waste gate, replaced the plugs (that were only a month old - what could kill the plugs so quick?) and could not get the boost to go up.

There is also a pretty good resonance at 3400 rpm that is new and feels very weak. It sounds and feels like drive line not exhaust.

When I brought the car in i could get 12-14lbs boost no problem. I just wanted it fine tuned.

when i left the shop he said maybe i need a new turbo so i agreed to purchase a set up, inter cooler and all, and have him install it.

On the way home after getting gas the battery was dead. Fans kept running.

I called him and he suggested that maybe i need a new motor.

I really need some sound advice here. I just want the car to run at it's best and I'm having a hard time getting that done.

bradenman1 · 05-26-2010, 04:15 PM

I had the same problem on my 7mgte turns out the manifold studs were all hand tight the maifold brace was not attatched and the gasket was destroyed ad the manifold was cracked. Check all of this ad alll your vacume lines they all make a big difference

Green7mgte · 05-26-2010, 06:14 PM

wow. sound advice would be to get a new mechanic. sounds like hes taking you for a drive. you went in for an exhaust leak and came out with 2k in parts.. now hes suggesting more. sounds like someone is trying to cover up some foul work. more information on this please.

Brutus · 05-27-2010, 01:33 PM

I need to clarify that it was my under drive pulley that was installed at my request so the shop cannot be blamed for that. Another mechanic suggested that many Japanese cars have their crank pulleys balanced with the crank so that is likely why the new pulley didn't work.
But it really ran like shit!
I highly recommend not changing the crank pulley unless you have it balanced with the crank - just say NO!

The boost still climbs slowly and won't go above 7 or 8 lbs. I'm thinking maybe the cat is plugged, although it is only a month old, (but so were the plugs and they had to be replaced).

Back to Split Fire today to check this out and hopefully finally have the car tuned on the Dyno. I have a time attack at Mosport this Saturday.

Brutus · 05-27-2010, 01:37 PM

I need to mention as well that Split Fire fixed my under-hood exhaust leak.
I will ask him today what the problem actually was.

05-18-2010, 03:36 PM	#1
CanadianBak'inSupra Official hall monitor / search nazi - NO SOUP FOR YOU! Join Date: Oct 2009 Location: Canada, BC Posts: 837	i just heat wrapped my manifold, and my manifold gasket was barly there... i would start with where manifold reaches exhaust. also its only like a 1.5$ / foot of the vacuum lines if you think its egr, just buy 10 ft and start 1 vacuum line at a time i replaced every line on mine just because i could for under 30 dollers (it took about 26 feet for my 84 5m-ge) also i have seen these manifolds crack, check for cracks and make sure the heat shield studs are all tight, because they go strait through to the inside of the manifold __________________ 1984 supra - 1uzfe - w58 - 4.10 - 1 piece aluminum shaft.

05-26-2010, 04:02 PM	#5
Brutus Stock Join Date: May 2010 Location: Peterborough Ontario Canada Posts: 5	Supra engine woes The exhaust leak has been fixed. I had the car in the shop for a week and after $800 it runs poorer than when it went in. I'm questioning the under drive pulley and the fan. When the fan is set too low, it runs after shut off and kills the battery. If it is set too high, the engine temp fluctuates - and when it gets hot, the a/c doesn't blow cold. As soon as the temp goes back down, cold a/c again. Can anyone explain this? Maybe the under drive pulley is turning the water pump too slow? Electric water pump? Also the car has a real problem getting boost and will not go above 7 or 8 lbs. and really struggles to get to higher revs (above 5000 rpm). At idle it has a stumble about every 5 seconds or so and that stays as the revs climb. The mechanics checked the entire system for leaks, replaced the waste gate, replaced the plugs (that were only a month old - what could kill the plugs so quick?) and could not get the boost to go up. There is also a pretty good resonance at 3400 rpm that is new and feels very weak. It sounds and feels like drive line not exhaust. When I brought the car in i could get 12-14lbs boost no problem. I just wanted it fine tuned. when i left the shop he said maybe i need a new turbo so i agreed to purchase a set up, inter cooler and all, and have him install it. On the way home after getting gas the battery was dead. Fans kept running. I called him and he suggested that maybe i need a new motor. I really need some sound advice here. I just want the car to run at it's best and I'm having a hard time getting that done. Last edited by Brutus; 05-26-2010 at 04:10 PM. Reason: spelling

05-26-2010, 04:15 PM	#6
bradenman1 3" Exhaust Join Date: Jan 2010 Location: texas Posts: 105	I had the same problem on my 7mgte turns out the manifold studs were all hand tight the maifold brace was not attatched and the gasket was destroyed ad the manifold was cracked. Check all of this ad alll your vacume lines they all make a big difference __________________ Cars: 1995 NIssan altima with 2 year old pant on black Drag DR-8 17x7 Wheels with brand new Goodyear Eagle GT's Custom Blue Parking lights with White silverstar head lights JDM Ebay Catback Exhaust. K&N air filter. (Totaled Due To An Idiot) bone stock (for now) 1990 Supra Turbo With a brand new CT-26 Turbo And New Exhaust Manifold. Now With A Brand New Blown Head Gasket Now driving a 99 Nissan Maxima 5spd with the passanger side bashed in from passing out at the wheel nice cars ehh??

05-26-2010, 06:14 PM	#7
Green7mgte Supra Forum Moderator Join Date: Nov 2009 Location: Green-Ohio Posts: 1,297	wow. sound advice would be to get a new mechanic. sounds like hes taking you for a drive. you went in for an exhaust leak and came out with 2k in parts.. now hes suggesting more. sounds like someone is trying to cover up some foul work. more information on this please. __________________ 92 Ma71 7mGTE Auto. SafcII Supra FAQ Supra MKIII FAQ Classified Section guidelines :

05-27-2010, 01:33 PM	#8
Brutus Stock Join Date: May 2010 Location: Peterborough Ontario Canada Posts: 5	Under Drive Pulley I need to clarify that it was my under drive pulley that was installed at my request so the shop cannot be blamed for that. Another mechanic suggested that many Japanese cars have their crank pulleys balanced with the crank so that is likely why the new pulley didn't work. But it really ran like shit! I highly recommend not changing the crank pulley unless you have it balanced with the crank - just say NO! The boost still climbs slowly and won't go above 7 or 8 lbs. I'm thinking maybe the cat is plugged, although it is only a month old, (but so were the plugs and they had to be replaced). Back to Split Fire today to check this out and hopefully finally have the car tuned on the Dyno. I have a time attack at Mosport this Saturday.

05-18-2010, 04:01 PM	#2
907mge 20psi boost Join Date: Dec 2009 Location: Harrisburg Posts: 759	Here is a good link about the exh man. studs that i've found as well as some other good info for anyone interested http://cjsupra.kendra.com/Helicoil.html

05-19-2010, 03:34 AM	#3
turbonicsperformance 3" Exhaust Join Date: Apr 2010 Location: sarasota fl Posts: 194	just pull a small vac line and run some atf into it look for the smoke and you've found your leak and gotten a slight decarbon or you could buy some seafoam and do it and get a full decarbon

05-24-2010, 11:24 PM	#4
vbryanv 3" Exhaust Join Date: Apr 2010 Location: new jersey Posts: 57	sat i blew a freeze out plug from the block and to replace it i had to take the exhaust manifold out. every bolt that came out came out wit threads and the rear 4 bolts where loose cause they where stripped. also from the head and gasket i can tell i had a major exhaust leak from cylinder 4 to 6. sucks now time to heli-coil. i will let you guys know how it comes out after repairs.

05-27-2010, 01:37 PM	#9
Brutus Stock Join Date: May 2010 Location: Peterborough Ontario Canada Posts: 5	Exhaust leak I need to mention as well that Split Fire fixed my under-hood exhaust leak. I will ask him today what the problem actually was.

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