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Ok last night while driving home (it was wet out.

Tiny
JWAYNNE122
  • MEMBER
  • 2000 MITSUBISHI GALANT
  • 175,000 MILES
Ok last night while driving home (it was wet out) my car rpm gauge started acting up, jumping from 1,000 rpms to 8,000 rpms and all in between. But the motor is not running at that high rpm, its running normal, even idles perfectly fine but the rpm gauge still is all over the place. Its spuddering a bit too when I'm driving (started when the rpm gauge started freaking out). Any suggestions on what it is? Please help. Ive left the battery unplugged for 10hours, did noting its still acting up. Need help fast this is my daily driver. Thanks
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Saturday, October 20th, 2012 AT 8:58 PM

10 Replies

Tiny
SATURNTECH9
  • MECHANIC
  • 30,870 POSTS
Have you checked for codes yet?
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Saturday, October 20th, 2012 AT 9:03 PM
Tiny
JWAYNNE122
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  • 5 POSTS
Havn't had the chance, I work 72hours a week and I live 40mins from the nearest town. I just had all the electrical replaced about a year ago, cost me 3grand, but I have had no issues in wet or snowy weather till last night. I checked all the fluids and everything is right where it should be at, so my only guess is electrical. I had to take today off work so I could drive to town and have it pluged in and post the code here if it would help
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Saturday, October 20th, 2012 AT 9:07 PM
Tiny
SATURNTECH9
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In your case instead of loosing a days pay might be cheaper to just buy a code reader they are pretty cheap these days. Yes codes would really help if there are any. Is your check engine light coming on?
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Saturday, October 20th, 2012 AT 11:57 PM
Tiny
JWAYNNE122
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  • 5 POSTS
I got it code checked only thing showing is random miss-fire and this issue happened right after the rpm issue, car run fine but when I'm holding speed or accelerating it miss fires, my guess is its getting to much air/fuel for the rpm it's really running at. Example; 60mph is 2300rpm normal but the rpm gauge is jumping all over so if its reading 6000rpm it's proubly giving air/fuel for 6000rpm rather that 2300rpm. But I don't know that's why I'm here =( even a quick temp fix would be great
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Sunday, October 21st, 2012 AT 7:24 AM
Tiny
SATURNTECH9
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Sounds like something got wet sounds like more like a ignition failure when under load its missfiring. So how often is the rpms miss reading too high?
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Monday, October 22nd, 2012 AT 12:29 AM
Tiny
RIVERMIKERAT
  • MECHANIC
  • 6,110 POSTS
Get a can of compressed air and disconnect the coil packs. Thoroughly dry the connectors (both sides) and apply a dielectric/waterproofing gel before reconnecting. This should rectify your issue. Have you had any service since the "electrical was replaced"? Are the plastic "skid plates" under the engine properly installed?
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Tuesday, October 23rd, 2012 AT 12:41 PM
Tiny
JWAYNNE122
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  • 5 POSTS
The rom gauge is always all over and never on, it was wet and is still rainin so I will try drying out the coil packs connectors and get something to put in them, I in town right now so I hope that will fix it, and yes I had all the electronics replaced 8 months back (al the sensors and main wirin harness and plug wires)
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Tuesday, October 23rd, 2012 AT 6:03 PM
Tiny
JWAYNNE122
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No serivce since the work done on electronics and all the wires have covers also, I checked them for corrosion
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Tuesday, October 23rd, 2012 AT 6:04 PM
Tiny
RIVERMIKERAT
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What about the plastic skid plates under the car? Are they all in place? If not, they can allow excess water up under the car which can these types of problems.
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Tuesday, October 23rd, 2012 AT 6:50 PM
Tiny
SATURNTECH9
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Also I would see if there is water build up where the coils go in?
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Tuesday, October 23rd, 2012 AT 7:21 PM

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