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Car runs very badly (and dies) when it warms up/cooling fan turns on (SOLVED)

649 Views 26 Replies 6 Participants Last post by  mossin_90
Hello everyone first post on this forum, coming from the club xterra forum

would like to say I tried searching for some solutions but still confused as what it needs to fix this particular issue. so ill start with some context

bought a 91 crx si with the original motor, and for the most part it would turn on and stay on rather well, old owner stated it ran "a bit rich"

First three weeks were solid motor wise, despite the idle going down for a second then coming back up quickly, it pretty much never died, unless i stalled it because i suck


FRIDAY- While leaving college in the morning, somebody throws a tangerine at my windshield (don't ask why), so i peel out pretty hard, not a clutch dump, but pretty close, i lost traction. Car ran normally and never really died. Later that night while driving up to LA, i noticed a bogging, detonation, misfire? sound while the motor was under any load, not catastrophic, but noticeable. The on the way back to OC, same thing happens. during warmup, it drives beautifully, but once hot it bogs a bit.

SATURDAY- Heading back up to LA to a friends house to install a hybrid racing short shifter, bogs/misfires/detonates? even worse than it did on Friday (after warmup), didn't die on freeway because i kept up the speed. it only died when i got off the freeway. It would not even hold idle anymore. Temperature was good, had plenty of fuel, just was not running right. Limp it to the house and find out it threw code 3 for the map

SUNDAY- we put an ebay MAP on it and it still runs really badly, it then threw the code for the EACV, which we proceeded to clean with carb cleaner. attempted to do idle relearn, but it just isn't happy when the car gets hot(not driving) especially when the fan turns on for the radiator, it basically kills it at idle



My friends are pretty competent mechanics, but the car is fooling us and not giving us any clues we could put together. Just wanted to hear what yall think the issue could be. I was thinking it hooped the timing tooth but that seems unlikley, but at this point ill try anything out

Thank you very much, i look forward to posting more on the forum
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Get the cables fixed up and check the inside terminals on the distributor cap and the rotor.

On a side note, those spark plugs looks like you are running lean. And I mean almost on fumes.
They should have a bit of a light brown at 1/3rd around the ceramic piece.
I replaced my distributor with a new one and it seemed to fix the problem completely. I wrapped it in foil to help deflect the heat from the radiator hose to hopefully prevent any heat problems

I am planning on rebuilding the OEM one with new wires and stuff, just had to get the car un-stranded

As far as running lean, I guess I can re check everything fuel but the car is the strongest it's ever felt I'm not gonna lie
Running lean runs faster than close to stock. Up to some point, But runs hotter Internally.
A bit too lean and things begin to fail.

Keep an eye on the temp gauge, wich BTW its what caused mine to damage the head gasket.

I saw steam blowing out the front windshield cowl and the temp gauge was still showing normal temp.
Running lean runs faster than close to stock. Up to some point, But runs hotter Internally.
A bit too lean and things begin to fail.

Keep an eye on the temp gauge, wich BTW its what caused mine to damage the head gasket.

I saw steam blowing out the front windshield cowl and the temp gauge was still showing normal temp.
My old Xterra had a overheat issue for ages and has trained me to stare at my temp gauge😂

It seems to hold temp well, also have a massive radiator, so I think I'm good but will keep note of it

How can I make my mixture more rich?
the plugs look normal after typical daily driving. Had new plugs been used, then engine shut off right after a hard pull, mossin would be correct.

Honda plugs don't read like a normal 350 chevy with an edelbrock intake and holley carb, like the OLD days.
Okay so I did Angeles Crest highway today and basically ran the sh*t out of my car, but it runs totally fine, the motor got nice and hot so my problem has been solved

Thank you everyone for helping me with this issue
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Okay so I did Angeles Crest highway today and basically ran the sh*t out of my car, but it runs totally fine, the motor got nice and hot so my problem has been solved

Thank you everyone for helping me with this issue
Glad you got it sorted out, now enjoy the ride!
^x2.
Have fun
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