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V70 2.5t down on power

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Daz86
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V70 2.5t down on power

Post by Daz86 » Fri Jun 21, 2019 4:42 am

Hi all I’ve got a 2003 v70 2.5t I changed the plugs yesterday and it would appear that it’s running lean . Also it seems down on power in the higher rev range . It’s holding .5 of a bar boost throughout the Rev range . Any ideas on what it could be



Daz86
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Re: V70 2.5t down on power

Post by Daz86 » Fri Jun 21, 2019 11:10 am

Just done a compression check and all 5 come back at 80/85 psi (dry) also throttle closed . Was very surprised about that for such a high milage car . fuel filter was changed almost 2 years ago . Any ideas ?



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Re: V70 2.5t down on power

Post by Roger_850T » Fri Jun 21, 2019 4:43 pm

With them that low across all cylinders, I would suspect something on the camshaft timing. Maybe something slipped a tooth. (I had this when I had a mistreated crankshaft gear that wasn't tightened down properly by a prior owner, and it was effectively delayed by about 1-2 teeth.)

I recommend you start by just examining the timing belt and see if the marks line up. Presumably it's been done at some point, and the marks are painted on the gears so it's easy. The second step on that would be to go one step further, and get out the cam locks for the back of the head, pull off the timing belt, and inspect by the crankshaft and camshafts, not just by the gears therein. It could also be a VVT hub mis-behaving, but inspecting by the crank and cams, not just the gears, should indicate something on that.

Also of note, I recently had an issue where it slipped one tooth on the crank. Root cause of that was an auxiliary belt that was shredding itself, and distributing debris in all sorts of bad places. While I didn't measure compression, I'll say I was low on power and running a little rough with it slipped one tooth on the crank, so symptoms are similar.

Good luck!

Roger


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Daz86
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Re: V70 2.5t down on power

Post by Daz86 » Sun Jun 23, 2019 4:31 am

Hi I checked the cambelt when I 1st bought the car and I couldn’t spot any painted on timing marks . Is there timing marks on the cam sprockets or on the vvt pulleys . The car runs absolutely fine can hardly tell it’s idling . Surely if the timing was out it would have issues running . Or would that just explain the lean running and the underpowered feeling .



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Re: V70 2.5t down on power

Post by abscate » Sun Jun 23, 2019 5:33 am

That compression data is suspect. Either the gauge is bad or the test wasn’t done correctly. ( bad crank speed, poor fitment of tool, loose fitting)

It won’t run well if at all with 80 psi compression


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Daz86
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Re: V70 2.5t down on power

Post by Daz86 » Sun Jun 23, 2019 5:43 am

I do no that the gauge is rubbish . I just did it as a bench mark kinda test . I’ve just checked the timing and it all looks spot on apart from the vvt hubs don’t look to be set up correctly
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Daz86
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Re: V70 2.5t down on power

Post by Daz86 » Sun Jun 23, 2019 8:34 am

Am I right I’m thinking that the inlet vvt hub is advanced and the exhaust one is retarded and they should both be roughly in the centre of the bolt slots



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Re: V70 2.5t down on power

Post by Daz86 » Mon Jun 24, 2019 5:40 am

Just done a 0 to 60 test and it’s 11seconds there’s definitely something holding it back . I’m gona take the new plugs out later on and check the condition



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Re: V70 2.5t down on power

Post by Daz86 » Mon Jun 24, 2019 7:22 am

Definitely running lean spark plug insulator has turned like a bronze colour
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Daz86
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Re: V70 2.5t down on power

Post by Daz86 » Mon Jun 24, 2019 11:14 am

So I’ve just done a fuel pressure check and I’m getting 60psi at the rail on idle so that eliminates that . Also I’ve just cleaned the maf with contact cleaner and my long term fuel trim has jumped up from 2.3% to 3.2% and I’m getting a slight fuel smell from the exhaust so something so simple as that may or cured my power problem I’ll find out tomorrow fingers crossed



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