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sandroosten

MEFI losing spark on one side when hot

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I have a buddy chasing an electircal gremlin on his LS1 powered LT car

he swears he has been through all of the grounds on the car.

when the car is cold operating under 150 it runs fine. when it gets hot 180-200 the passenger side seems to lose spark (all four cylinders)

we have tried a few different things. I let him borrow the whole coil set up off my car and it still did it.

he just reinstalled the motor after taking it out and freshening it up and put a new intake on it.

any ideas on something he might be missing? half tempted to just replace the entire harness. anybody else ever had this problem?

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Yep, was a relay.

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Harness stock? Check power to (usually pink wire) to coil pack, injectors usually run on same relay for each bank. The temp driving the loss of power to coil pack weird.  If no power to the pink, check relay/fuse. Should also be 3 grounds off of harness. You could jump power from one side of coil pack to other and see if that solves the issue. 

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On 5/7/2019 at 8:04 AM, lincster said:

Yep, was a relay.

thank you.

is that the ignition relay?

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1 minute ago, sandroosten said:

thank you.

is that the ignition relay?

Correct.  That is what mine was.

But it could be any relay.

Get a new relay and start swapping out and see which one it was.

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2 minutes ago, lincster said:

Correct.  That is what mine was.

But it could be any relay.

Get a new relay and start swapping out and see which one it was.

my thoughts as well.

thank you for the help.

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ended up putting a new hot wire from the battery to the the MEFI. same issue i had with my car a few years ago.

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