Starting trembling Issue

TRULYTAMMY

MEMBER
2008 PONTIAC G6
3.5L
6 CYL
4WD
AUTOMATIC
191,000 MILES

My car cut off at a red light and would not start back. Replaced fuel pump (local shop) and car ran fine for some hours then car cut off again in traffic at a red light. Replaced fuel pump again (same local shop at no cost to me) car ran fine for 2 days. Now the car hesitates to starts but once it does start and go it drives fine until I get speed (on the interstate)the car gets the "hiccups" and at red lights it trembles a bit". Is this the fuel pump again or something else? (I've had the car for 2 years and bought it from an auction. No issues with it at all until now).

9 Replies

ASEMASTER6371

MECHANIC
52,797 POSTS

Good morning,

I would have the shop do a fuel pressure test to verify the pump is working correctly.

https://www.2carpros.com/articles/how-to-check-fuel-system-pressure-and-regulator

Beyond that, I would have him check for codes. Let me know if there are any codes.

https://www.2carpros.com/articles/engine-surges

Roy

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Tuesday, December 3rd, 2019 AT 8:21 AM

TRULYTAMMY

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7 POSTS

Thank you! When the car cut off the second time in traffic I had it towed to the shop (Pep Boys) and was told the replacement fuel pump was working correctly. I did see they used a Precision fuel pump from O'Reillys (not sure if it matters but I have read reviews Precision pumps are trash) so they replaced the fuel pump a second time as I requested (no charge to me so no receipt to see the brand of pump). The check engine light was on until I got the replacement pump now there is no check engine light on. Before I left the shop tho he said if the car cuts off again have it towed back and he'll replace my trunk fuse box. I'm a mom with a toddler and have little knowledge about cars so I'm not sure what's the real issue. Should I also have other things looked at such as idle valves or oxygen sensors? Or does replacing a fuse box in the trunk sound accurate since he is certain the pump isn't defective.

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Tuesday, December 3rd, 2019 AT 9:36 AM

ASEMASTER6371

MECHANIC
52,797 POSTS

Did he tell you what code was set? Is it written on the receipt?

Rear fuse block? Why? What explanation did he give you for that.

Roy

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Tuesday, December 3rd, 2019 AT 9:39 AM

TRULYTAMMY

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7 POSTS

I'll upload my receipt because I'm not sure what to look for! He said since the replacement pump is not defective then it may be the fuse box itself that has the issue (I don't know what that means that's just what I was told).

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Tuesday, December 3rd, 2019 AT 9:53 AM

TRULYTAMMY

MEMBER
7 POSTS

I totally forgot about something. When I purchased the car from auction 2 years ago it displayed the "hiccups" for a day or so and hasn't done it again until now. I did go to AutoZone when it happened 2 years ago and they said code P0463. Maybe that'll help!