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No Power after timing belt change

Help, Advice and DIY Tutorials on Volvo's extremely popular car line -- Volvo's 1990s "bread and butter" cars -- powered by the ubiquitous and durable Volvo inline 5-cylinder engine.

1992 - 1997 850, 850 R, 850 T5-R, 850 T5, 850 GLT
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granger57
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No Power after timing belt change

Post by granger57 » Wed Aug 24, 2011 2:34 pm

I had my 98 S70 brought to the shop this morning and had my mechanic ( friend of mine ) put a new timing belt tensioner and idler pulley on , he did the belt 2 weeks ago but didn't think I needed to change the others. I had him do it after reading too many stories of failure. So I pick up the car and drive off and immediatly notice NO POWER, seems to run fine no code lights on just no power, it's not misfiring . I brought it right back and he's looking for the problem. When he did the timing belt it was fine same power as when I dropped it off. It acts like a bad MAF sensor however when I drove it there this morning it was peerfect. ANY IDEA WHAT IT COULD BE ? , did he set the timing right ? not sure if he removed belt when putting new tensioner and pulley on. Any help would be appreciated.



JRL
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Re: No Power after timing belt change

Post by JRL » Wed Aug 24, 2011 3:14 pm

I thought you said he's a mechanic?
That's their job, to diagnose a problem (especially since it's possible he caused it)!


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renns
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Re: No Power after timing belt change

Post by renns » Wed Aug 24, 2011 3:27 pm

If he put on a new tensioner and idler, it's possible it was assembled with cams out of time.


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granger57
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Re: No Power after timing belt change

Post by granger57 » Wed Aug 24, 2011 4:24 pm

I think it was out of time with the cams, I just got back from picking it up again, It's back to having power but I'm not sure it's a 100 % , when he did the timing belt it was like full power, now the one mechanic said they can be off just a degree and loose power, It idles well no missing, seems to have power but know I'm concerned could it still be off just a fraction. Is it possible to be off just a degree and loose just a touch of power, I'm just relieved I have new tensioner , belt and Idler. It's the 1st Volvo I've ever owned , I just bought it a few weeks back and did most work my self like brakes all the way around, transmission flush, coolant flush hose changes and upper tourqe engine bushing, airbox mod, horn relocation, new plugs. All this was done just reading this site, you guys are good !!!! I didn't want to touch timing belt without someone who knows how to do it.



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Re: No Power after timing belt change

Post by boosted5cyl » Wed Aug 24, 2011 6:41 pm

If they did the job half-properly, the timing cannot be more than one tooth out and yes it would affect peformance. If they for some idiotic reason pulled the three bolts off the cam pulleys then there is a chance that its possible that its a few degrees out.

Generally if the timing is out it will throw a code. If the Check Engine light isnt on, I wouldnt worry too much about it.


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Re: No Power after timing belt change

Post by precopster » Wed Aug 24, 2011 7:25 pm

You may have read all the botch ups but that is nothing in comparison to the amount of succesful DIY belt changes that have been done. That's why you only read of the bad ones; because the good ones don't post of problems :)

If correct marking of all the cam sprockets has been done, including scribing the cam bolt holes with a sharp tool, there is no reason to re-assemble a timing belt "slightly off" Were the front seals changed as well? This may explain why it's slightly off because during seal change the sprockets need to be removed. If the seals were'nt changed it's pretty sloppy mechanical work.

Get your friend to have another go at it but because he probably didn't mark it properly.


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Re: No Power after timing belt change

Post by darylrobert » Thu Aug 25, 2011 3:46 am

Its easy to check yourself. After reading many posts i was worried the pulley marking were hard to find but mine was a very clear notch.
timing-belt-markings.jpg
crankshaft
crankshaft markings.jpg
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