99 BMW 323i losing power to engine - Engine Troubleshooting


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99 BMW 323i losing power to engine

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thereign83
New User

Oct 24, 2012, 10:03 AM

Post #1 of 4 (4485 views)

99 BMW 323i losing power to engine	Sign In

I need help because I cannot figure out whats going on with my BMW. I have a 1999 BMW 323i four door sedan that is losing power to the engine, when I first crank up my car it works perfectly fine, when I crank it up for a second time in a short time span it cranks up then loses power as soon as I either step on the brake or decelerate, if I crank it up for a third time in a short time span it won't crank up at all, it just rolls over. When I let it sit for a couple hours afterwards it cranks up fine with no issues. I have a new batter and I've also have a new alternator, so the vehicle is getting power just fine, engine just dies.

If anyone has any ideas as to why the engine would lose power when cranking it up multiple times in a short time span please share. Is it an electronic issue with a relay? Or is it possibly the starter going bad?

(This post was edited by thereign83 on Oct 24, 2012, 3:20 PM)

nickwarner
Veteran / Moderator
nickwarner profile image

Oct 24, 2012, 5:12 PM

Post #2 of 4 (4400 views)

Re: 99 BMW 323i losing power to engine	Sign In

If the starter was bad it wouldn't turn over. It seems like your engine is turning over at the proper speed but not able to stay running. You should have trouble codes stored in the ECM. Get them scanned and post the exact code numbers here.

Check fuel pressure, it sounds like you may have a fuel starvation issue. When was the last time you changed the filter?

thereign83
New User

Oct 24, 2012, 5:18 PM

Post #3 of 4 (4399 views)

Re: 99 BMW 323i losing power to engine	Sign In

I haven't changed my gas filter since I've had my car, It also might be the fuel pump relay.

(This post was edited by thereign83 on Oct 24, 2012, 5:19 PM)

nickwarner
Veteran / Moderator
nickwarner profile image

Oct 24, 2012, 5:41 PM

Post #4 of 4 (4393 views)

Re: 99 BMW 323i losing power to engine	Sign In

You need to verify fuel pressure first. if you suspect a relay you would need to backprobe it while running to see if it is cutting out and allowing a pressure drop.

If you have never changed the fuel filter, do it now. I change mine once a year.

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