My 305 doesnt idle correctly and it stumbles when i give it some gas.

5

Asked by Apr 26, 2015 at 03:43 AM about the 1988 Chevrolet Caprice Classic Sedan RWD

Question type: Maintenance & Repair

I changed the spark plugs less than 20 km ago and they are really black. It also has broken valve stem seals....making it smokey on cold starts. im guessing its running rich. could anyone help?

7 Answers

107,485

I would suggest pulling the codes, see what is stored. MAP sensors can get out specs and not set off the light, so check all of the codes. The other problem is the seals, if they are leaking like that then it is a good possibility that it has fouled the O2 sensors, the catalytic converters will be next as they can only handle small amounts of oil in the exhaust before they start plugging up.

1 of 1 people found this helpful.
8,175

If you are certain that the valve stem seals are "broken" then you have oil from the cylinder head getting into the combustion chamber which will create smoke and seriously foul the plugs.

5

is it posible that codes be stored without a check engine light. I dont have a check engine light on, and my car is carburated. The cat converter is clogged but i made a big hole in it.... i didnt run the car for a year, i let it idle today for a good 20 mins, it seemed to get better.

107,485

Yes I have seen the old OBD 1 do that. A stumble can be a bad accelerator pump in the carb, or worn throttle shaft bushings, even severely worn timing chains can do that. Make sure the base timing is correct and the computer changes the advance when you reconnect the spout connector.

1 of 1 people found this helpful.
Best Answer Mark helpful
107,485

You might consider a carb overhaul if it hasn't been updated with the new E10 resistant componets. Or find some station that still sells actual gasoline not E10 and run it.

5

Thanks, il try a new O2 sensor and later get my carb overhauled. i heard to stay away from remans. my original has only 152,000km on it.

107,485

Yes if at all possible have your carb overhauled, the remains over the counter are terrible and a new one any more are getting expensive.

Your Answer

Caprice

Looking for a Used Caprice in your area?

CarGurus has 151 nationwide Caprice listings starting at $7,495.

ZIP:

Chevrolet Caprice Experts

  • #1
    Js08016
    Reputation
    520
  • #2
    dandyoun
    Reputation
    270
  • #3
    tennisshoes
    Reputation
    240
View All

Related Models For Sale

Used Chevrolet Camaro
534 Great Deals out of 31,191 listings starting at $1,450
Used Chevrolet Monte Carlo
7 Great Deals out of 1,226 listings starting at $1,125
Used Dodge Charger
439 Great Deals out of 35,097 listings starting at $2,000
Used Ford Mustang
450 Great Deals out of 42,576 listings starting at $1,488
Used Buick Regal
148 Great Deals out of 6,585 listings starting at $3,995
Used Chevrolet Corvette
134 Great Deals out of 16,194 listings starting at $3,000
Used Ford Crown Victoria
3 Great Deals out of 946 listings starting at $1,496
Used Cadillac DeVille
1,428 listings starting at $2,695

Content submitted by Users is not endorsed by CarGurus, does not express the opinions of CarGurus, and should not be considered reviewed, screened, or approved by CarGurus. Please refer to CarGurus Terms of Use.