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Cold Start chugging and stumbling and white smoke


Brad & Jacolyn

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I have looked in the Resource Guide and did not find the problem so here goes. For about the last month during the first start of the day the Volvo chugs and stumbles and makes white smoke for about 5 - 10 seconds and then smooth's out and runs fine. It almost sounds like she does not fire on all cylinders like maybe no fuel and then gets fuel and runs fine. Am I losing part of the prime over night or somewhere sucking a little air??? Like I said this is only on the first start of the day. Any suggestions guys?

 

Brad

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Sounds like you might have an injector or compression issue goin on there. Could be a leaking valve or sticky piston, too though. At any rate, you want to get that looked at as soon as you can. White smoke is from unburnt raw fuel going through your exhaust system. It's pretty typical for issues like that, on a cold start, to clear up as the engine warms, but I sure would't ignore it. It might just be a little fouling around the piston rings, but better safe than sorry.

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Brad, it sounds a little like my problem a couple of years ago. And it became worse as time went on. Injector cup had become bad on one, and an O ring on another. Coolant was mixing with fuel (and fuel mixing with coolant) and I "fogged" a couple of campgrounds before I got it fixed.

I thought white smoke meant water being burned (steamed), blue was oil, and black was fuel! I probably have those mixed up.

 

Since your repair is going to involve going "up top" of the motor, I wonder what else you could have done while it is opened up? What are the suggestions guys. I should have asked this question before they replaced two injectors in mine.

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I thought white smoke meant water being burned (steamed), blue was oil, and black was fuel! I probably have those mixed up.

 

You're right. Black is fuel too. Generally bad air to fuel ratio so your fuel isn't burning as fully as it should so it emits as large partially burned fuel molecules. White smoke is wholly unburnt fuel. Generally speaking, that is. At least in the situation he described where it's just during cold starts then the engine evens out and it stops smoking. It could be moisture in the fuel as well, but that is generally white "misty" and runs continuously.

 

Probably right though that it's only going to get worse... and any color comin' out your pipes... you gotta know your mileage is suffering.

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Sometimes a small coolant leak into one or two cyl will allow a small amount of coolant to puddle on top of the piston and that will cause the effected cylinder(s) to misfire until the coolant is cleared out enough so that the normal firing can start to take place.

 

In the mechanical engine days lugging too much would often build cyl pressures that compromised the head gasket sealing and coolant leaks were often the first point of progressive failure........

 

Might be wise to cast a intense light beam down the oil-fill tube and often you might see some white foam clinging to the tube walls.

 

A quick oil sample sent to a lab could be helpful as well.......

 

Drive on...........(no white exhaust........)

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HI BRAD

To begin with I'm in agreement with Rocky,Dolly, an Bob A.

Dealers-Volvo, Kenworth, Check the labor rates for the top end tune-up which should address most of your problems it runs about $6oo. plus parts. Since I have a Kenworth I'm a little prejudice but many KW dealerships are also Volvo dealers and there labor rates are often. less than a straight Volvo dealer. We have always been very happy with the KW dealers we have dealt with over the last 8 years.

GOOD LUCK and keep us informed as to how your doing!

 

roadfitter

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HI BRAD

I just talked to Inland Group Kenworth in Albuquerque there labor rate is $126. an hr. and the top end tune-up is $504 + parts.

1 hr. labor rate for diagnostics $126. We had a good experience with them in Tucson last February for what that's worth..

My question is what engine do you have, is it Volvo or another brand? If you have other than a Volvo engine I would definitely give them a look see.

Keep us up to date.

 

roadfitter

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It's more than a top end set there is no point in fixing just one they wear out and all 6 will need to be done, injectors need to be pulled cups and o rings replaced the valves all re set, parts aren't ridiculous but there is a bit o labour

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Vonda came home today with 2 new fuel injectors. As always Volvo thinks everything is gold plated but since no one else I have found will work on Volvo engines I guess we will pay. She did run very smoothly on the way home and may have had a little more power but we will see when we leave next week.

 

Brad

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