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Old 04-28-2016, 06:36 PM   #1
vascorama
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Question Ignition cut on road bumps

Howdy folks, my 2002 wrx has an issue thats driving me nuts. When i go on road bumps the car shuts off the engine, its happens really quickly and its hard to notice if driving above 20 mph because ir shutsdown real quick, but because the car is running on gear the engine picks up again, all this in about 1/10 second.
On this video: https://www.youtube.com/watch?v=k91sp7jbEUE

You can see the engine light comes on and off as i pass the bumps, i was going up the road on gear, because on the way down if i put in neutral, the engine shuts down completelly, dash lights and stereo stay on, and that is why i think its ignition related.

I check all grounds on the engine bay, messed around the wires on the engine and bellow the dash with the engine on, and cant replicate the issue...

Any ideas?
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Old 04-28-2016, 07:47 PM   #2
aerosaaber
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you sure there's not loose plug wire or maybe a partial short that only grounds when you hit the bump? maybe a sensor is failing or it's harness is failing which tells the ECU the engine stalled, then it's back working again and it just acts normal.
Can you FEEL the car buck or slow when it happens? IF not then I'd lean more toward something amiss between the ECU and the gauges.
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Old 04-28-2016, 07:51 PM   #3
vascorama
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Hi aerosaaber, yes the car "bucks"(dunno this term), i guess you mean that feeling like when an engine mount is broken and the engine is "loose". Im sorry, my poor english keeps me from explaining this better...
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Old 04-28-2016, 09:49 PM   #4
Cougar4
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I think you may be correct about the issue being in the ignition area. Power to the ignition may be getting interrupted. You might be able to find the problem by using one of my favorite tricks. Tapping on suspected trouble spots using a screwdriver handle. While the engine is idling, tap on areas you think the trouble is at, like a wire harness connector. Try places under the hood and under the dash, including the ECU. Hopefully you will locate the area.

Your English is really pretty good.
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Old 04-29-2016, 09:17 AM   #5
vascorama
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Im on the second day tapping like that on some spots, i found that tapping method usefull too . Already took off the IC and look those wires bellow too, no luck until now...
Im almost at the edge of ordering parts to test
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Old 04-29-2016, 09:46 AM   #6
darkstarmoto
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Just asking....do you have a ton of keys/junk on your key ring? If you do, try just using the ignition key and run over same bumps and see if the condition persists.
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Old 04-29-2016, 09:51 AM   #7
vascorama
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Hi, thank you for the advice, i dont use a lot of keys, onky the car key, and i remembered that too and tried another key i have...
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Old 04-29-2016, 01:38 PM   #8
vascorama
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The car was on the shop recently, they fitted a used gearbox and rear diff from a classic gt, considering the car only does that on bumps, could it be something gearbox related? Im a bit desperate here...2 days checking wires and test driving, still nothing :\
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Old 04-29-2016, 03:05 PM   #9
LIChuck
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Check the battery terminals. Clean and tighten them. It can also be an internal battery problem. If cleaning and tightenting the terminals doesn't work, try borrowing a battery and swap it in, see if that fixes it.
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Old 04-29-2016, 06:25 PM   #10
vascorama
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Ill do that tomorrow, although seems to me that if it was a battery issue the other systems would blink too. Worth the try though. A while ago i removed the instruments and checked the wires behind, still nothing...
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Old 04-29-2016, 09:28 PM   #11
Cougar4
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If using the tapping method under the hood and the dash area doesn't turn up anything then check the main relay, which may be behind the passenger side kick panel or near it. The relay has two sets of contacts. One set supplies power to the engine sensors and ignition coils. To me, that relay seems the most logical spot for the trouble. You might just try replacing it even if tapping on it doesn't show up anything and see if that helps.

Last edited by Cougar4; 04-29-2016 at 09:33 PM.
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