Rebuilt Fresh - Won't Start - have searched!
12-17-05, 01:10 AM
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Rebuilt Fresh - Won't Start - have searched!
Hi everyone, well, specifically to those who've put rebuilt engines back into thier 7's before. alas my friends, we have a problem.
we've got everything all hooked up... everything is in tip-top shape as far as we can tell, the only questionable are the spark plug order, and those stupid fuel lines... she just won't start... so, here are the symptoms.
she turns over, gets great steady compression and puffs from the exhaust just like a bought one but won't ignite.
trailing plugs spark when tested; leading we need to check again as we think there may have been a grounding issue. and just realised i may have mixed them up in the build.
fuel lines are currently ordered (when looking into the engine from directly side on)
0 - pressure chamber
from fuel tank - 0 0 - fuel tank return
any thoughts anyone? i'm going to watch the family guy in the meantime (and bleed, cause she just bit me)
we've got everything all hooked up... everything is in tip-top shape as far as we can tell, the only questionable are the spark plug order, and those stupid fuel lines... she just won't start... so, here are the symptoms.
she turns over, gets great steady compression and puffs from the exhaust just like a bought one but won't ignite.
trailing plugs spark when tested; leading we need to check again as we think there may have been a grounding issue. and just realised i may have mixed them up in the build.
fuel lines are currently ordered (when looking into the engine from directly side on)
0 - pressure chamber
from fuel tank - 0 0 - fuel tank return
any thoughts anyone? i'm going to watch the family guy in the meantime (and bleed, cause she just bit me)
12-17-05, 02:32 AM
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UPDATE UPDATE UPDATE!!
The problem is in the ignition system, has to be.
the leading plug aren't getting any spark through the distributer or HT leads. for some reason, the leading plug distributor just isn't giving it anything.
currently i have the 'blue plug' on the system at the front of the car, the 'black plug' on the rear and the ground just below it on the rats nest... is there something maybe lurking deeper in that that might be f*ing it up?
all help appreciated.
The problem is in the ignition system, has to be.
the leading plug aren't getting any spark through the distributer or HT leads. for some reason, the leading plug distributor just isn't giving it anything.
currently i have the 'blue plug' on the system at the front of the car, the 'black plug' on the rear and the ground just below it on the rats nest... is there something maybe lurking deeper in that that might be f*ing it up?
all help appreciated.
12-17-05, 03:04 AM
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ok, the actual distributer is fine... checked with the trailing plug... got a nice shock!!
so, what is the plug sequence?
from the firewall, do the plugs onto the distributors go white -> black -> blue... thats how i have them but want to check that is right.
so, what is the plug sequence?
from the firewall, do the plugs onto the distributors go white -> black -> blue... thats how i have them but want to check that is right.
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12-17-05, 05:52 AM
#8
The ignition coil connectors go: (From front to back) white, black, blue.
Be sure you've got your leading plug wires connected properly - L1 is the front lower plug, L2 is the rear lower plug.
Some possible gotchas: fuel injection problem, ignition coil harness ground shorting out
Dave
Be sure you've got your leading plug wires connected properly - L1 is the front lower plug, L2 is the rear lower plug.
Some possible gotchas: fuel injection problem, ignition coil harness ground shorting out
Dave
12-17-05, 01:50 PM
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front to back (white, black, blue)? as in, the white plug is closest to the front of the engine bay, and the blue is closest to the flywheel? that would mean that i have them COMPLETELY round the wrong way... right?
that would have my spark timing out by about 180 degrees wouldn't it? but it should still spark right... i'm getting nothing at all. so i'm thinking, maybe there is one of 2 things happening here.
1. grounding issue - how many grounding wires come off the distributors? is the one in the centre of the three plugs the most important?
2. what would happen is i mixed up the crank angle sensors in the build? it would still spark right? just at the wrong time?
that would have my spark timing out by about 180 degrees wouldn't it? but it should still spark right... i'm getting nothing at all. so i'm thinking, maybe there is one of 2 things happening here.
1. grounding issue - how many grounding wires come off the distributors? is the one in the centre of the three plugs the most important?
2. what would happen is i mixed up the crank angle sensors in the build? it would still spark right? just at the wrong time?
12-17-05, 01:53 PM
#10
Coils and plugs are easy to figure out. Each coil has a sticker, and each sticker is a different color. Each coil plug is also the same color, so just plug the colors together. THe coils are also marked as far as wire position, l1 t2 etc. so it is easy to place the wires correctly, since the block is marked L and T and 1 is front 2 is rear.
As for the crank angle sensors, white plug goes on top. The sensors themselves are identical and can be mixed up.
As for the crank angle sensors, white plug goes on top. The sensors themselves are identical and can be mixed up.
12-17-05, 02:04 PM
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excellent! its first thing sunday morning in new zealand... ready to give this another shot!
so, if the CAS sensors were mixed up, would it still spark off the leading coil?
and, does the fact that it sparked off the trailing coil plug mean that i don't have a grounding problem?
so, if the CAS sensors were mixed up, would it still spark off the leading coil?
and, does the fact that it sparked off the trailing coil plug mean that i don't have a grounding problem?
12-17-05, 02:27 PM
#12
Again, the cas's are identical so mixing them up doesnt matter. Mixing the wires up would cause a timing difference (both in the spark and the fuel) and though you would still get spark, you wouldn't get it at the right times. Again, white plug on top.
Spark is one of those things that you either have or you don't. Since spark relies on engine ground to occur, if you have spark, you can assume you have a decent engine ground.
Spark is one of those things that you either have or you don't. Since spark relies on engine ground to occur, if you have spark, you can assume you have a decent engine ground.
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