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Starting issue (Bad aftermarket MAF) new Bosch MAF worked Topic is solved

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
1997 - 2000 S70, S70 AWD
1997 - 2000 V70, V70 AWD
1997 - 2000 V70-XC
1997 - 2004 C70

Sommerfeldt
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Year and Model: 1996 850 T5
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Re: Starting issue

Post by Sommerfeldt »

Not a lot of ways to test the fuel filter, except what abscate suggested - get a gauge and check fuel pressure. If it's low, cross your fingers that it's the filter, and change it. Check with gauge again. If no change, worry about pump. If you don't know when the fuel filter was changed last, it's probably time anyway.

- S
'96 855 T5, R bumper and spoiler, Koni Yellows & blue H&R springs all 'round.
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theWIFES_S70
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Re: Starting issue

Post by theWIFES_S70 »

Change out that fuel filter. Like Sommerfeldt said, if you don't know if it's been changed, it probably needs to be changed. I've seen too many 98s with original fuel filters in them... Not a good move. You might have a big chunk of something in there that gets lodged and dislodged as fuel is drawn into the engine. Lets hope that's the case, considering the money you've spent thus far.

When I replaced my fuel filter, the fuel that came out of it was black and had sand-like grit in it. (Maybe it was sand?) You could even run to Autozone and pick one up for $17 bucks and see if it cures this problem. (Of course, sometime in the next couple of years, you'll want to get a Mahle or Bosch in there...) You can do the job with the wheels on the ground. (But it's a LOT easier when you put the car on ramps.) Good luck. And keep us posted.
1998 Volvo S70, N/A, 5-speed, 185K
2007 Volvo S40, 2.4i, 5-speed, 100K
ChadLee
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Year and Model: 1998 V70
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Re: Starting issue

Post by ChadLee »

Replaced fuel filter. Same starting issue. Unplugged MAF, started right up. As soon as the plug is back on the MAF, the engine chokes and dies. Keep the MAF plugged in and the engine will fire up after consistent cranking. Bad MAF?
1986 245 DL, 1989 244, 745 Turbo and 1981 245 DL - gone to new homes
1989 245 GL - Wife's daily driver
1989 245 DL - In the works for a daily
1998 V70 - Daily driver
2001 V70 - Next project
Sommerfeldt
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Year and Model: 1996 850 T5
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Re: Starting issue

Post by Sommerfeldt »

ChadLee wrote:Bad MAF?
Yup. But make sure there aren't any bad hoses and vacuum leaks around that can mess with the MSF readings as well.

- S
'96 855 T5, R bumper and spoiler, Koni Yellows & blue H&R springs all 'round.
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Clemens
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Re: Starting issue

Post by Clemens »

Did you replace the maf with the correct oem part when you replaced it a while back? If yes and you already changed it i would, as suggested above, check electrical connections and vacum hoses around the maf. If not oem, this is most likely your problem.
Summer: 1996 855 R
Winter: 1994 855 T5M
Donor: 1995 854 10V
ChadLee
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Re: Starting issue

Post by ChadLee »

I am pretty sure that I skimped and put in a NAPA maf......shame on me. Sometimes you have fail so you can succeed. That being said, swap it out for a Bosch immediately or are there vacuum tests that I can run to zero in on the issue?
1986 245 DL, 1989 244, 745 Turbo and 1981 245 DL - gone to new homes
1989 245 GL - Wife's daily driver
1989 245 DL - In the works for a daily
1998 V70 - Daily driver
2001 V70 - Next project
Sommerfeldt
Posts: 1136
Joined: Tue Jul 29, 2008 1:25 pm
Year and Model: 1996 850 T5
Location: Oslo Area, Norway
Has thanked: 55 times
Been thanked: 36 times

Re: Starting issue

Post by Sommerfeldt »

It's pretty well known that these cars only like the Bosch units, for whatever reason. It's not exactly clear what Bosch does that the others don't, but they're the only ones that will work right. In my experience, they pay for themselves pretty quickly in increased MPG.

Since the car at the moment works better with the MAF unplugged, it's pretty safe to say that you need to swap it out with a Bosch unit right away. If you still have ~18 year old hoses, then those are probably ripe as well - remember that they sometimes look OK, but will leak under pressure or vacuum. In my experience, rotting or damaged vacuum/IAC hoses, elbows and/or clamps make up about 70-80% of starting/idle/boost irregularities on these cars.

- S
'96 855 T5, R bumper and spoiler, Koni Yellows & blue H&R springs all 'round.
ChadLee
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Joined: Mon Aug 08, 2016 11:50 am
Year and Model: 1998 V70
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Re: Starting issue

Post by ChadLee »

If I go to IPD, they have all colors of hoses. Am I ok to just get any 5mm silicone hose and start replacing each, one by one? Thank you for giving me someone to bounce things off of. I have used forums as a resource, but never posted before.
1986 245 DL, 1989 244, 745 Turbo and 1981 245 DL - gone to new homes
1989 245 GL - Wife's daily driver
1989 245 DL - In the works for a daily
1998 V70 - Daily driver
2001 V70 - Next project
Sommerfeldt
Posts: 1136
Joined: Tue Jul 29, 2008 1:25 pm
Year and Model: 1996 850 T5
Location: Oslo Area, Norway
Has thanked: 55 times
Been thanked: 36 times

Re: Starting issue

Post by Sommerfeldt »

Yeah, that's the way to do it. Strictly speaking, there are 4, 5 and 6 mm hoses here and there, but the size doesn't much matter. I've used 5 and 6 mm all 'round. If you want to replace the brake booster vacuum hose (from manifold, under air box, to booster), you need something sturdier in 8 or 9 mm (I think it's 8).
Like you said, do one hose at a time, so you don't end up with a tangle that can get hard to unravel. :)

- S
'96 855 T5, R bumper and spoiler, Koni Yellows & blue H&R springs all 'round.
ChadLee
Posts: 39
Joined: Mon Aug 08, 2016 11:50 am
Year and Model: 1998 V70
Location: Bellingham
Has thanked: 6 times

Re: Starting issue

Post by ChadLee »

If you had to guess how much hose to buy.....10 M?
1986 245 DL, 1989 244, 745 Turbo and 1981 245 DL - gone to new homes
1989 245 GL - Wife's daily driver
1989 245 DL - In the works for a daily
1998 V70 - Daily driver
2001 V70 - Next project
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