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post #1 of 5 (permalink) Old 08-07-2012, 09:06 AM Thread Starter
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Odd Problem with Gauges and Engine

For background info I drive a 2008 G5 5 speed. Its almost to 50k miles. Probably original fuel filter, fresh oil, moderate air filter.
So here's the issue, over the last few weeks I've noticed a small surge or bump (terrible description) when accelerating. It happens randomly, sometimes just cruising sometimes when I'm accelerating decently fast. It almost feels like a misfire. I planned on doing the fuel filter and air filter to fix that. But last night I was driving and it did it enough that my girlfriend felt it. This concerned me. Then while I was parallel parking I was waiting for my friend to back up more and had my car in reverse but with the clutch in and out of nowhere the speedo jumped to 140mph and the fuel gauge dropped to empty and my car shut off. I turned it back on to finish parking and it started without a problem but the fuel gauge remained at empty. When I turned it on to leave it was still empty so I filled up but only got 10 gallons in a 13 gallon tank. Also this is the second time the fuel gauge did this. The last time I was driving and it dropped to empty and my dic told me "low fuel" or something similar but did not shut off. I turned my car off and on then and it was fine.

I feel like the misfire feeling is probably a separate problem, but I figured Id mention both. If anyone has experience with this or can help me Id greatly appreciate it. I do not want to let this go in case it escalates.

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post #2 of 5 (permalink) Old 08-07-2012, 12:46 PM
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Bad grounds will do all kinds of funny stuff to a car. In your case the engine to chassis ground would produce both syptoms, your car misfiring and your gauges acting up. This is the one in front of the engine, but I would check all grounds to make sure they are tight and clean. Also verify that your boost post is tight, that can also cause some freakish symptoms.

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post #3 of 5 (permalink) Old 08-09-2012, 10:24 AM Thread Starter
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Thanks Coby, Ill check that when I get off and get back to you with what I find.

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post #4 of 5 (permalink) Old 08-10-2012, 02:17 PM Thread Starter
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I'm not seeing that ground on my car. Is it visible from above or should I put it on a lift?

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post #5 of 5 (permalink) Old 08-10-2012, 02:43 PM
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From above to the right.

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