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Morning after it rains the car bucks violently for a couple of minutes

Tiny
BFS
  • MEMBER
  • 1993 BUICK CENTURY
  • 3.3L
  • 6 CYL
  • FWD
  • AUTOMATIC
  • 116,000 MILES
The morning after it rains the car bucks violently for a couple of minutes, then it passes. This is the only time this happens. I use name brand regular gas. What could be causing this?
Saturday, October 1st, 2016 AT 8:34 AM

8 Replies

Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
Scan for codes and check fuel pressure with a gauge auto parts rent it. here is a helpful article.
https://www.2carpros.com/articles/how-to-check-fuel-system-pressure-and-regulator
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Saturday, October 1st, 2016 AT 1:04 PM
Tiny
RENEE L
  • ADMIN
  • 1,260 POSTS
Hello BFS,

If you decide you would like to conduct the scan yourself here is a link to an article that features written step by step instructions and pictures explaining how to do the scan yourself, also I have included a link to our YouTube channel with a how to video on code scanning. Most scanners are inexpensive to purchase, you can purchase one online from sites like Amazon.com

https://www.2carpros.com/articles/checking-a-service-engine-soon-or-check-engine-light-on-or-flashing

https://youtu.be/YV3TRZwer8k

Once you have the codes please get back to us so that we can further assist you. We are always happy to help.

Thank you for visiting 2CarPros.com.

Kindest regards,

Renee
Admin
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Saturday, October 1st, 2016 AT 6:09 PM
Tiny
BFS
  • MEMBER
  • 4 POSTS
Thank you for the replies. You both mentioned checking for codes, even though the check engine light never came on. Also there were no thoughts on why it only happens after it rains and why it passes after a few minutes. Just curious. I will go to auto zone and ask them to scan for me. Thanks.
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Sunday, October 2nd, 2016 AT 6:57 AM
Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
Something is getting wet causing the bucking either a module or distributor part. Like a cap may be bad or something like that and is drying up so check those. If ignition coils check for leakage around it shorting out.
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Sunday, October 2nd, 2016 AT 7:47 AM
Tiny
BFS
  • MEMBER
  • 4 POSTS
There you go, moisture has to be the cause. Maybe YouTube has something on the components involved? My car is pre 1996 so uses the old diagnostic system. Jumper wire and count the flashes. I will sniff around and see what I can see. Thanks!
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Monday, October 3rd, 2016 AT 6:22 PM
Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
Thinking of the moisture problem you might check the ignition module where the coils are and check for spark around coils when it does this especially if it's dark you will be able to see if it is a bad coil leaking or an ignition module then use some dielectric grease on contacts where coils bolt in.
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Tuesday, October 4th, 2016 AT 5:59 AM
Tiny
BFS
  • MEMBER
  • 4 POSTS
UPDATE:
Hmac300.
So today I did a brief inspection and noticed the #1 spark plug boot on the distributor was sitting higher than the rest.
No doubt you can guess where this is going.
When popped off lots of rust poured out. I cleaned it all off and put some dielectric grease on it.
Last few days have been rain free so wont know for sure till next time it rains, but I will bet that was the issue all along.

Many thanks for steering me in the right direction boss. You da man!
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Wednesday, October 5th, 2016 AT 4:47 PM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 48,363 POSTS
Glad we could get it fixed please use 2CarPros. Com anytime we are here to help.

Hmac300 is the man, he helps people all across the world!

Best, Ken
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Wednesday, October 5th, 2016 AT 9:15 PM

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