Question about 1987 Volvo 240

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My 1987 volvo sputters, backfires and accelerates very slowly while cold but when it warms up after a few minutes it runs fine. I recently changed the fuel filter and a fuel relay switch. Any suggestions? Thank you

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Try using a fuel additive like wynns/stp to clean the injectors,cheapest fix first......

Posted on Jun 07, 2010

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Posted on Jan 02, 2017

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I have a 1997 Jeep Cherokee Sport 4.0 I6 with about 155k miles that is having intermittent issues. I just recently had to replace my muffler because of the car backfiring. This problem doesn't happen...


From what you posted,it may be a few different problems.BUT.The 1st thing I would look at is the cat/converter may be blocked.Hey.It may not be.But look at that before you spend any money on other stuff.I just thought.How is your air filter.Take it out and take the car for a short run and see how it goes.This may show what is wrong.Hope this helps

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It's the automatic choke!

The choke is "closed" or barely open... When cold, the engine needs a RICH mixture (more gasoline, less air). When the engine warms up, it requires a LEAN mixture (less gas, more air).

It is probably creating BLACK tailpipe smoke ... that means unburnt gasoline. (Blue smoke is OIL, white smoke is WATER).

Put the parking / emergency brake ON.
1. Remove air cleaner assembly from intake, use a carb cleaner spray or throttle body spray cleaner and spray just a little. (AutoZone $5)
2. Find the accelerator2.gif arm under the hood.
3. start car, rev the engine to make sure how to operate the accelerator from under the hood.
4. Carefully spray into carb / throttle body and work the accelerator ... don't let the engine die...
5. Watch out for "backfire"... it may create a small flame out of the carb. It will extinguish itself in one second.

6. You may need to do this two, three times.
7. Add a "complete fuel system2.gif cleaner" to your next tank of gas ($8).

That's it! ... pretty cheap, too.

Hope this helps!

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