86 fuel injector problem
Thread Starter
Heel & Toe
Joined: Mar 2018
Posts: 20
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86 fuel injector problem
hi guys
need some advise on this problem
my 86 has been sat for around 7 years, would start up but ran really rough for around a minute or so then would die.
ive changed fuel pump, pressure regulator, filter and injectors, now getting 45psi at fuel rail but with the ignition on I’m getting power to all the fuel injectors at the same time ( tested with noid light)
could it it be a faulty ECM ? As read the ecm grounds the injectors, Or what else should I try first ?
parts are hard to get hold of as I’m in the UK
many thanks
need some advise on this problem
my 86 has been sat for around 7 years, would start up but ran really rough for around a minute or so then would die.
ive changed fuel pump, pressure regulator, filter and injectors, now getting 45psi at fuel rail but with the ignition on I’m getting power to all the fuel injectors at the same time ( tested with noid light)
could it it be a faulty ECM ? As read the ecm grounds the injectors, Or what else should I try first ?
parts are hard to get hold of as I’m in the UK
many thanks
Team Owner
Joined: Jul 2004
Posts: 28,502
Likes: 3,302
From: Hartford WI
now getting 45psi at fuel rail
but with the ignition on I’m getting power to all the fuel injectors at the same time ( tested with noid light)
could it it be a faulty ECM ? As read the ecm grounds the injectors, Or what else should I try first ?
parts are hard to get hold of as I’m in the UK
many thanks [/left]
but with the ignition on I’m getting power to all the fuel injectors at the same time ( tested with noid light)
could it it be a faulty ECM ? As read the ecm grounds the injectors, Or what else should I try first ?
parts are hard to get hold of as I’m in the UK
many thanks [/left]
I believe it is going to be hot so it requires the ECM to ground it for firing.
IF the pressure drops after it starts, it makes me think that someone is not telling the pump to keep pressure up. Try the test first.
Thread Starter
Heel & Toe
Joined: Mar 2018
Posts: 20
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As soon as the ignition is on (Engine not cranked) the fuel is being dumped through all the injectors, if I disconnect the electrical plug to each injector the fuel pressure hold at 45psi, but if I plug any of the injectors in its spraying fuel straight away, constant power not even pulsing.
Team Owner
Joined: Jul 2004
Posts: 28,502
Likes: 3,302
From: Hartford WI
As soon as the ignition is on (Engine not cranked) the fuel is being dumped through all the injectors, if I disconnect the electrical plug to each injector the fuel pressure hold at 45psi, but if I plug any of the injectors in its spraying fuel straight away, constant power not even pulsing.
Team Owner
Joined: Jul 2004
Posts: 28,502
Likes: 3,302
From: Hartford WI
Follow the harness all the way from the injectors to the ECM and look for any cuts Just a thought to make sure that you are not cut somewhere Doubt it but want to be sure
Race Director
Joined: Oct 2008
Posts: 17,982
Likes: 1,074
From: Lansing MI
You need a wiring schematic.
It seems to me the ecm controls the ground side of the injectors, in other words there should be power to them at all times, and if that's the case, then I would think a simple short in the wrong place would do exactly what you are describing.
It seems to me the ecm controls the ground side of the injectors, in other words there should be power to them at all times, and if that's the case, then I would think a simple short in the wrong place would do exactly what you are describing.
- 1986 Original Owner -
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Don’t say “No chance”. Where in the UK are you? I have a ‘165 ECM your could use to test, so there might be a chance.
Last edited by Ray Quayle; Mar 27, 2018 at 01:54 PM.
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RQ - How you doing?
Last edited by WVZR-1; Mar 27, 2018 at 02:42 PM.
- 1986 Original Owner -
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From: North Yorkshire, England
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- 1986 Original Owner -
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Thread Starter
Heel & Toe
Joined: Mar 2018
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I’m in West Sussex, I’m going to check out the wiring this weekend on the fuel injectors but if needed do you have a spare ECM I could buy from you ?? I’ve read that there is bank firing 1357- 2468 on the 86 but when the ignition is turned on ( engine not cranked ) all 8 injectors are firing at once
- 1986 Original Owner -
Joined: Apr 1999
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From: North Yorkshire, England
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I’m in West Sussex, I’m going to check out the wiring this weekend on the fuel injectors but if needed do you have a spare ECM I could buy from you ?? I’ve read that there is bank firing 1357- 2468 on the 86 but when the ignition is turned on ( engine not cranked ) all 8 injectors are firing at once
Thread Starter
Heel & Toe
Joined: Mar 2018
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Sounds a plan ;-) pm sent
Thread Starter
Heel & Toe
Joined: Mar 2018
Posts: 20
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Yep going to get out there this weekend with the meter, going to pull the plugs from the ECM first and check for a ground then work through the wiring with the FSM and check and double check everything