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  #1  
Old 02-10-2012, 07:54 AM
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Default 99 s70 t5 burnt exhaust valve

Car was running good until vibration during acceleration. Had it checked at a non volvo shop and they found #2 cylinder with no compression. Dis all the tests but compression remained at o > All other cylinders had 135 psi compression. Looks like it needs a valve job. BTW there is 267000km on the clock but the car is in very good shape.
Would you fix it and what do you think it would cost?
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  #2  
Old 02-10-2012, 10:16 AM
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I would fix it, sounds like it needs a replacement motor. It only has 165,000 miles which is nothing for these cars, if properly maintained.

Here's the kicker, how long have you had the car? If the compression numbers are that bad what else has been neglected? Compression numbers should be 156 - 185 so those numbers are WAY low. My guess would be that someone skipped a LOT of oil changes. If they skipped oil changes, EVERYTHING ELSE was neglected. The good thing is that these cars were built very well. That's why it looks good. Maybe that's the only thing they did, keep it clean and fix what breaks.

Have the car checked out from bumper to bumper to find out what other problems are lurking to surface then make your decission. It is possible that you need a lot more maintenance that will cost you some good $$$.

Has the timing belt been replaced?
How old is the suspension?
When was the plugs last replaced?
Has the ETM been replaced?
Is the brake system due replacement?
Are the brake lines cracked?

I suggest you look at this situation as a CAR PURCHASE PROPOSAL. If someone came to you and offered you this car for $100, pay the $100 knowing that you needed a new motor and other things that are now pending? Look through the DIY Sticky section in the 850 section and check out the buyers guide. If you would take the car knowing it has a bad motor and other problems you or a mechanic finds, move forward. It may be time to cut bait and run.
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'98 S70 GLT - Lil' Red - Daughter 22/30 mpg
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Volvo's of time past: '87 740 GLE, '79 262C Bertone, '78 264, '95 960, '97 960, '98 S90, '98 S70 GLT, '95 850 T-5R Yellow, '95 960, ,96 850 R...
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  #3  
Old 02-11-2012, 08:26 AM
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Default 99 s70 t5 burnt exhaust valve

Thanks for the reply. I have owned the car for 10 years. Switched to Mobil 1 synthetic 6 years ago and change the oil at 7-7500km. Car is well maintained. An interesting point, when the non Volvo tech removed the plug in the effected cylinder, the plug was broken in half where the porcelain met the steel body.
I spoke to 2 Volvo techs and they feel a valve job is what is in order but they have not seen the car. They also felt the compression was low but after the valve job it would most likely go back up to the acceptable range.
Everything else on the car has been well maintained. Only routine maintenance work needs to be done.
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  #4  
Old 02-11-2012, 10:51 AM
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Thanks for your reply. What octane and type of fuel do you normally pump? Also, have you ever run fuel injector cleaner in the gas tank?

Having a broke spark plug, the car had to be missing? Did you have a cel and rough idle prior to loosing compression? When was the last time the plugs were replaced?

The compression being low across the board is NOT good. They can do what is called a leak-down test to see if your valves are leaking or your piston rings are worn. Seeing that you have been replacing oil every 4,600 miles with full synthetic oil is awsome, I'm really surprised to hear that you have compression issues, I'm stumped. Unless the compression issues are with dirty valves from running bad gas. I've been under the impression that running good quality full synthetic oil will help your motor last forever.

I really appreciate you sharing. Do figure out WHY your motor burnt a valve. You don't want to repair the motor and find yourself back in the same boat in 2 years from not fixing the source of the initial problem.
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'95 850 T-5R Wagon - Panther - Daily Driver 22 / 28 mpg
'98 S70 GLT - Lil' Red - Daughter 22/30 mpg
--------------------------------------------
Volvo Repair Videos - Used Parts For Sale - Interior Lights For Sale - ABS Light? Click Here - Men's Mentoring
--------------------------------------------
Volvo's of time past: '87 740 GLE, '79 262C Bertone, '78 264, '95 960, '97 960, '98 S90, '98 S70 GLT, '95 850 T-5R Yellow, '95 960, ,96 850 R...
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  #5  
Old 02-12-2012, 08:34 AM
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Default 99 s70 t5 burnt exhaust valve

The car started to vibrate on acceleration 2 days before I took it to a tech. It was only on acceleration as far as I could tell. Other than that it ran well. I always run Sunoco Ultra 94(in Canada) or Ultra 93(in the US). There were never any other engine issues with this car other than burning some oil. I was told by Volvo service that this was normal with a high pressure turbo. I'm concerned by the lower compression in the other cylinders. After speaking with a Volvo tech he said that with 267000km and a high pressure(T5) turbo the other valves could be starting to wear and it wasn't long for a valve job. I bought the car 3 years old, 10 years ago and I really baby this car. The tech wasn't surprised and implied this happens more than you might think. My question is if I decide to have it repaired and have the head rebuilt, is do they replace the valves in the defective cylinder or all of them . I assume that with having the head rebuilt that they would replace all the valves etc.
The guy that found the issue and did the wet test etc had never worked on a Volvo T5 so I'm not to confident with what he is saying (good guy but no Volvo experience). I need to tow it 40 miles to a Volvo dealer and I don't want to be held ransom when I get it there.
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  #6  
Old 02-12-2012, 09:58 AM
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Man, you don't have to baby these cars, just keep them serviced. Thanks again for the update and information. Sounds like you have been doing everythng right. I guess you have not been using any fuel injector cleaner, not that your injectors or valves were dirty. I wonder if your failed spark plug caused your problem.

The fact that your guy found the burnt valve is good, The fact that he hasn't seen it in Volvo's is even better. I really wouldn't worry about the guy hacking up your valve / head job. Just ask if they do head jobs often. I don't believe there is anything special about these cars as the job goes. Heck, guys on this site do it themselves with no real mechanic experience. Most will send the head off to a speciality shop to have the work done, likely the same place the stealer will use. Just ask the shop if they do heads and tell them that you would want all worn or damaged valves replaced. Usually exhaust valves burn, the car has 10 of them. Not sure if you need to have all 20 valves replaced. A good head shop will clean the head, inspect all the valves, replace all the worn & damaged ones and install new valve stem seals. Some people get new/rebuilt heads, that may be an exchange deal.

Letting the shop do it vs the Volvo dealer may be a cost difference of 50% to 75%. You can ask about a warranty to see if there is any difference there. Time and price would be my big concern. Also need to know why this all happened.

I have heard of these cars burning valves but not really often. I'm on these Volvo sites all the time and it's not uncommon to hear of people having more than 200,000 miles (320,000 km) with no valve issues. Way more common to hear about broken timing belts or a bad transmission.

My big deal is trying to figure out what caused the burnt valve. Sounds like you only had your hesitation issues for a few days. Not sure if you can burn a valve that fast? What brand spark plug was it? How old was the plug (miles/km)?
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'98 S70 GLT - Lil' Red - Daughter 22/30 mpg
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Volvo's of time past: '87 740 GLE, '79 262C Bertone, '78 264, '95 960, '97 960, '98 S90, '98 S70 GLT, '95 850 T-5R Yellow, '95 960, ,96 850 R...
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  #7  
Old 02-12-2012, 09:00 PM
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Quote:
Originally Posted by koch69 View Post
The car started to vibrate on acceleration 2 days before I took it to a tech. It was only on acceleration as far as I could tell. Other than that it ran well. I always run Sunoco Ultra 94(in Canada) or Ultra 93(in the US). There were never any other engine issues with this car other than burning some oil. I was told by Volvo service that this was normal with a high pressure turbo. I'm concerned by the lower compression in the other cylinders. After speaking with a Volvo tech he said that with 267000km and a high pressure(T5) turbo the other valves could be starting to wear and it wasn't long for a valve job. I bought the car 3 years old, 10 years ago and I really baby this car. The tech wasn't surprised and implied this happens more than you might think. My question is if I decide to have it repaired and have the head rebuilt, is do they replace the valves in the defective cylinder or all of them . I assume that with having the head rebuilt that they would replace all the valves etc.
The guy that found the issue and did the wet test etc had never worked on a Volvo T5 so I'm not to confident with what he is saying (good guy but no Volvo experience). I need to tow it 40 miles to a Volvo dealer and I don't want to be held ransom when I get it there.
koch69:
Sounds like you have been doing a great job of maintaining this vehicle but at this mileage things are going to happen. If it were me, i would rebuild the head and the bottom end too (since you already mentioned it's using oil) considering the mileage.

But if you do this, and pay someone to do the labor, then you're going to spend more than the car is worth; especially since this is a '99 MY. This vintage is known for ETM and transmission failures (like rspi mentioned). So if you haven't already replaced/repaired those two items, then you're likely on borrowed time there too.

As far as replacing all the valves; i would ask the machine shop. Back when i wrenched professionally we would re-cut the valves (unless they were too heavily pitted) but not sure about modern valves; may not be surface-able.

BTW rspi; valves can burn up for any number of reasons; any data you may accumulate to support one theory or another (w/o strictly controlled test conditions) will be purely circumstantial.
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1998 S70 GLT, 70K mls, Bilstein TCs, IPD sways.
1996 855T, 120K mls,
N/A cams, N/A intake manifold & TB, ARD green w/M4.4, OBX improved, white injectors, 18T, R ExMan, Bilstein TCs, IPD sways, AEM boost and AFR gauges. Fun DD!
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  #8  
Old 02-12-2012, 10:08 PM
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GDog, yes, I do know that these valves can burn for several reasons but I'm trying to get a lead on it. Yes, I know one problem can be 180 different than the next but I'm really collecting as much data as I can at this point.

From what I have learned so far, lean fuel mix is a big cause for exhaust valves buring up and getting damage. Also valve stem leaks, carbon build up on valves, and the lack of exhaust back pressure.

Man, if it were possible to find some common cause on these cars it would be nice. I may be dreaming but please don't kick me for trying.
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'98 S70 GLT - Lil' Red - Daughter 22/30 mpg
--------------------------------------------
Volvo Repair Videos - Used Parts For Sale - Interior Lights For Sale - ABS Light? Click Here - Men's Mentoring
--------------------------------------------
Volvo's of time past: '87 740 GLE, '79 262C Bertone, '78 264, '95 960, '97 960, '98 S90, '98 S70 GLT, '95 850 T-5R Yellow, '95 960, ,96 850 R...
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  #9  
Old 02-12-2012, 10:41 PM
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Quote:
Originally Posted by rspi View Post
I may be dreaming but please don't kick me for trying.
LOL.. not trying to kick anyone Man! Knock yourself out..
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Understanding how something is supposed to work, makes repairing it so much easier!

1998 S70 GLT, 70K mls, Bilstein TCs, IPD sways.
1996 855T, 120K mls,
N/A cams, N/A intake manifold & TB, ARD green w/M4.4, OBX improved, white injectors, 18T, R ExMan, Bilstein TCs, IPD sways, AEM boost and AFR gauges. Fun DD!
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  #10  
Old 02-13-2012, 06:58 AM
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In changed the plugs with Volvo OEM plugs about 2000miles ago. I was surprised with the amount of deposits on the plugs. After the change the car ran very well. The Volvo tech is summing it up to age, mileage and possibly a bad plug that actually was broken in half. I don't think I am going to do the bottom end. gdog, your right the cost would be more than it's worth. The tranny is a 5 speed and so far no issues. The original owner abused this car and I'm afraid may have caused the oil burning issue. I had the dealer run a history and it looks like 3 oil changes in 30k miles. Plus the condition overall was not good. Bring a 5 speed Turbo, I think he just beat the crap out of it for 3 years on lease then turned it back in. I was always told by the Volvo service manager that these T5's were notorious for burning a bit of oil because of the high pressure turbo. He felt a liter over 5000kms was not bad, actually good. It took me a long time to get back to where it was suppose to be - wheel bearings, brakes, sensors, etc

What is your take on replacing the water, fuel and oil pumps since it will be apart? Timing belt, serpentine will get changed? Anything else that you think should be replaced? I appreciate your feedback.
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Old 02-13-2012, 06:58 AM
 
 
 
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