7mgte, replaced head gasket, turbo, not cranking

dgee509 · 04-24-2011, 05:05 AM

I had the same problem with my 1990 n/a supra. I found a plug dangling from my wire harness that I believe had a brown wire and a yellow wire going to it that was hanging right next to my starter. I searched for day trying to figure out where it went, but it turns out it wasn't being used for anything. My problem was in my fuse block under the hood. The AM 1 fuse was blown which pretty much controls your ignition system along with some other things. I would check both the AM1 and the AM2 fuses. Good luck with the car and I hope you get the bragging rights!

87supra7mgte · 04-25-2011, 02:30 AM

i found the wire today after some tedious looking around the intake manifold with my friend, he recalled seeing a wire but failed to mention so yesterday. so it cranks!!!!! now it just has to start......timing is good, and spark is great(managed to arc about 2 inches when we checked with screwdriver against metal) we re double checked it just to be 100% for sure. there are numbers on my coil packs and i have the spark plugs on according to that, which to me make sense. although i have found before that just because it makes sense doesn't mean its right, so from left to right here is my plug wire sequence-1-6-3-4-2-5, is this correct? also i get the feeling im not getting fuel. when i checked the plugs they weren't wet. to me that means its not getting fuel, is it getting spark?, yes, but if it is, then why isn't it starting? its not spittin, sputterin, backfirin or anything, just cranks. sometimes it will pause for a second then crank a few times again, then do it again. any ideas there? my thought was battery dying slowly

87supra7mgte · 04-25-2011, 02:46 AM

also i would love love love to see a picture of the distribut cap(i don't have one) or whatever it is on the exhaust side of the head right behind the thermostat housing, and fuel injector connectors, i coulda swore when i removed them it was (in order front to back) white, red, green, white, red, green, but now all thats plugged in is white and red, but there are 6 of them, im so lost

interested! · 04-25-2011, 09:04 PM

Hi!
After overhauling my cylinder head I got to the point of turning the key to start it-turned over nicely but no sign of it starting-tried several times and thought I had better have another look at all the connections , everything looked good ABOVE the manifold but there were a whole bunch of wires underneath that were NOT connected ( I forgot they were there !) to the manifold ( all EARTH WIRES! ) -connected them and car started.

87supra7mgte · 04-25-2011, 09:18 PM

All ground wires underneath are connected, I'm thinking it may not be getting fuel. What are the stock colors of the fuel injector connectors? I coulda swore I took off white green and red but the ones on it are just red and white. Its either that or clogged fuel lines, filter, or the injectors, its getting fuel up to the line on the block. Do the bolts in those have to point a certain way? I know they have holes in the bottom, I figure to let fuel pass through, could that be my problem? I don't recall seeing indicators for them to point to but I could be wrong.

dgee509 · 04-26-2011, 03:58 AM

Those bolts on your fuel rail are banjo fittings and they will let fuel pass no matter what direction the hole is facing so that isn't your problem... U said the timing was good, but are you 100% sure it is good? Did you set your timing with the #1 piston on TDC (Top Dead Center)? If you did, make sure you set it on the compression stroke and not the exhaust stroke. It sounds to me like you may have your timing set 180 degrees off. This would explain why your car turns over a couple times then stops. I hope I have helped you out.

Conga1991 · 04-26-2011, 04:15 PM

The parts you are reffering to behind the thermostat housing on the exhaust side of the head is the cam position sensor. Did you time that correctly per TSRM?? like the last guy posted you could be 180* off. Put the crank at TDC as well as cam gears. pull out the cam position sensor take the cover off if you have one on and line up the marks. heres the TSRM link on how to do that.

http://www.cygnusx1.net/Supra/Librar...ection=IG&P=21

04-25-2011, 02:30 AM	#2
87supra7mgte 3" Exhaust Join Date: Apr 2011 Location: Tacoma, WA Posts: 63	i found the wire today after some tedious looking around the intake manifold with my friend, he recalled seeing a wire but failed to mention so yesterday. so it cranks!!!!! now it just has to start......timing is good, and spark is great(managed to arc about 2 inches when we checked with screwdriver against metal) we re double checked it just to be 100% for sure. there are numbers on my coil packs and i have the spark plugs on according to that, which to me make sense. although i have found before that just because it makes sense doesn't mean its right, so from left to right here is my plug wire sequence-1-6-3-4-2-5, is this correct? also i get the feeling im not getting fuel. when i checked the plugs they weren't wet. to me that means its not getting fuel, is it getting spark?, yes, but if it is, then why isn't it starting? its not spittin, sputterin, backfirin or anything, just cranks. sometimes it will pause for a second then crank a few times again, then do it again. any ideas there? my thought was battery dying slowly __________________ 87 supra, 7MGTE, head gasket and turbo replaced, runs and boosts! fixing wiring odds and ends, then storage for a year basically...then comes big money cash in er, lookin for 500+ to the ground and a very sleek, sexy mkiii

04-25-2011, 02:46 AM	#3
87supra7mgte 3" Exhaust Join Date: Apr 2011 Location: Tacoma, WA Posts: 63	also i would love love love to see a picture of the distribut cap(i don't have one) or whatever it is on the exhaust side of the head right behind the thermostat housing, and fuel injector connectors, i coulda swore when i removed them it was (in order front to back) white, red, green, white, red, green, but now all thats plugged in is white and red, but there are 6 of them, im so lost __________________ 87 supra, 7MGTE, head gasket and turbo replaced, runs and boosts! fixing wiring odds and ends, then storage for a year basically...then comes big money cash in er, lookin for 500+ to the ground and a very sleek, sexy mkiii

04-25-2011, 09:04 PM	#4
interested! 3" Exhaust Join Date: Apr 2011 Location: redhill surrey uk Posts: 142	car won't start Hi! After overhauling my cylinder head I got to the point of turning the key to start it-turned over nicely but no sign of it starting-tried several times and thought I had better have another look at all the connections , everything looked good ABOVE the manifold but there were a whole bunch of wires underneath that were NOT connected ( I forgot they were there !) to the manifold ( all EARTH WIRES! ) -connected them and car started.

04-25-2011, 09:18 PM	#5
87supra7mgte 3" Exhaust Join Date: Apr 2011 Location: Tacoma, WA Posts: 63	All ground wires underneath are connected, I'm thinking it may not be getting fuel. What are the stock colors of the fuel injector connectors? I coulda swore I took off white green and red but the ones on it are just red and white. Its either that or clogged fuel lines, filter, or the injectors, its getting fuel up to the line on the block. Do the bolts in those have to point a certain way? I know they have holes in the bottom, I figure to let fuel pass through, could that be my problem? I don't recall seeing indicators for them to point to but I could be wrong. __________________ 87 supra, 7MGTE, head gasket and turbo replaced, runs and boosts! fixing wiring odds and ends, then storage for a year basically...then comes big money cash in er, lookin for 500+ to the ground and a very sleek, sexy mkiii

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04-24-2011, 05:05 AM	#1
dgee509 Stock Join Date: Apr 2011 Location: killen, al Posts: 16	I had the same problem with my 1990 n/a supra. I found a plug dangling from my wire harness that I believe had a brown wire and a yellow wire going to it that was hanging right next to my starter. I searched for day trying to figure out where it went, but it turns out it wasn't being used for anything. My problem was in my fuse block under the hood. The AM 1 fuse was blown which pretty much controls your ignition system along with some other things. I would check both the AM1 and the AM2 fuses. Good luck with the car and I hope you get the bragging rights!

04-26-2011, 03:58 AM	#6
dgee509 Stock Join Date: Apr 2011 Location: killen, al Posts: 16	Those bolts on your fuel rail are banjo fittings and they will let fuel pass no matter what direction the hole is facing so that isn't your problem... U said the timing was good, but are you 100% sure it is good? Did you set your timing with the #1 piston on TDC (Top Dead Center)? If you did, make sure you set it on the compression stroke and not the exhaust stroke. It sounds to me like you may have your timing set 180 degrees off. This would explain why your car turns over a couple times then stops. I hope I have helped you out.

04-26-2011, 04:15 PM	#7
Conga1991 3" Exhaust Join Date: Jun 2009 Location: Avondale, AZ Posts: 169	The parts you are reffering to behind the thermostat housing on the exhaust side of the head is the cam position sensor. Did you time that correctly per TSRM?? like the last guy posted you could be 180* off. Put the crank at TDC as well as cam gears. pull out the cam position sensor take the cover off if you have one on and line up the marks. heres the TSRM link on how to do that. http://www.cygnusx1.net/Supra/Librar...ection=IG&P=21