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Can a bad ground cause the engine to stutter under load?


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well maybe its not a bad ground.

I normally had a usb cable from my stereo head unit (in the glove box) running under the dash and coming out near the ignition switch.

I would occasionally experience stuttering under load and difficulties starting the car.

My mechanic suggested I change the ignition switch as a remedy to both symptoms.

After getting the car back from the shop the car ran perfectly. (The usb cable was not there)

I put the usb cable back as before and the stuttering symptom returned, but it started just fine.

Well, i removed the usb cable and the symptoms continued.

Thats when I suspected that there was an issue with the wires near the ignition near where I had the usb cable running.

So I kinda gently moved the wires to give each space and tightened what I suspected was a ground wire.

Since I've done that the car has run great again, with no stuttering.

 

 

 

 

 

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Quote

Can a bad ground cause the engine to stutter under load?

hell, yeah.

 

But the usual symptom is slow cranking.

 

t

 

"I learn best through painful, expensive experience, so I feel like I've gotten my money's worth." MattL

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11 hours ago, aldo.navarro.13 said:

well maybe its not a bad ground.

I normally had a usb cable from my stereo head unit (in the glove box) running under the dash and coming out near the ignition switch.

I would occasionally experience stuttering under load and difficulties starting the car.

My mechanic suggested I change the ignition switch as a remedy to both symptoms.

After getting the car back from the shop the car ran perfectly. (The usb cable was not there)

I put the usb cable back as before and the stuttering symptom returned, but it started just fine.

Well, i removed the usb cable and the symptoms continued.

Thats when I suspected that there was an issue with the wires near the ignition near where I had the usb cable running.

So I kinda gently moved the wires to give each space and tightened what I suspected was a ground wire.

Since I've done that the car has run great again, with no stuttering.

 

 

 

 

 

What color was the suspected ground wire?

Ray

Stop reading this! Don't you have anything better to do?? :P
Two running things. Two broken things.

 

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1 hour ago, aldo.navarro.13 said:

I think it was yellow or orange-ish.

I think that weren't a ground, most likely.

 

Actual chassis ground wires are always brown on these cars.

 

Cheers,

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Ray

Stop reading this! Don't you have anything better to do?? :P
Two running things. Two broken things.

 

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  • 3 weeks later...

This problem with the engine 'stuttering' was driving me crazy but I think I finally have it fixed.

Now my 02 is accelerating very smoothly even uphill and through all the gears.

The problem was that my ignition switch was not functioning as it should and needed to be replaced.

Having to pay $350 for the electronic part of the ignition was absurd to me, but I had no choice.

I suppose I could have replaced the ignition switch with a on/off and a momentary switch.

Its just crazy that a faulty ignition switch could cause the engine 'stuttering'.

 

 

 

 

 

 

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10 hours ago, aldo.navarro.13 said:

Having to pay $350 for the electronic part of the ignition

The stuttering stopped ... but the gagging started!

Yikes, did $350 include the switch installation and a new battery and starter motor?

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17 hours ago, aldo.navarro.13 said:

This problem with the engine 'stuttering' was driving me crazy but I think I finally have it fixed.

Now my 02 is accelerating very smoothly even uphill and through all the gears.

The problem was that my ignition switch was not functioning as it should and needed to be replaced.

Having to pay $350 for the electronic part of the ignition was absurd to me, but I had no choice.

I suppose I could have replaced the ignition switch with a on/off and a momentary switch.

Its just crazy that a faulty ignition switch could cause the engine 'stuttering'.

 

 

 

 

 

 

Yes, it is exceedingly absurd that a "switch" related to the "ignition" could adversely affect engine performance.

 

:)

  • Haha 1

Ray

Stop reading this! Don't you have anything better to do?? :P
Two running things. Two broken things.

 

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44 minutes ago, ray_ said:

Yes, it is exceedingly absurd that a "switch" related to the "ignition" could adversely affect engine performance.

 

:)

Did I see that once, even quit entirely? :lol:

A radiator shop is a good place to take a leak.

 

I have no idea what I'm doing but I know I'm really good at it.

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12 minutes ago, jimk said:

Did I see that once, even quit entirely? :lol:

You've seen everything once!

 

😁

Ray

Stop reading this! Don't you have anything better to do?? :P
Two running things. Two broken things.

 

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9 hours ago, John76 said:

The stuttering stopped ... but the gagging started!

Yikes, did $350 include the switch installation and a new battery and starter motor?

we should be thankful to some degree that BMW sees fit to make repair parts for a car (mine) that just passed it's 50th birthday. these are not, and never have been, cheap cars, even when sold new in 1972.

  • Like 1

72 2002tii

1988 535is  “Maeve”

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