Login Register

Search found 1116 matches

by dosbricks
20 Jun 2017, 20:15
Forum: 850 and S70, V70, C70, V70-XC 1992-2000
Topic: At hwy. speed engine stumbles when letting off accelerator
Replies: 12
Views: 3732

Re: At hwy. speed engine stumbles when letting off accelerator

Hey dos, how's your throttle cable? Is it old, rusty, and unresponsive? Can you recreate this scenario by revving the car up to 4000RPMs, or does it only happen in fifth gear? Southern car is always garaged so not rusty, but this sounds plausible and easy to sound out. I'm here in Houston tonight a...
by dosbricks
19 Jun 2017, 21:01
Forum: 850 and S70, V70, C70, V70-XC 1992-2000
Topic: At hwy. speed engine stumbles when letting off accelerator
Replies: 12
Views: 3732

Re: At hwy. speed engine stumbles when letting off accelerator

Thanks, mrbrian. The MAF is genuine Bosch two years old so pretty confident it isn't involved. So will continue on the same repair track. I'll post back if resolved.
by dosbricks
19 Jun 2017, 17:58
Forum: 850 and S70, V70, C70, V70-XC 1992-2000
Topic: At hwy. speed engine stumbles when letting off accelerator
Replies: 12
Views: 3732

Re: At hwy. speed engine stumbles when letting off accelerator

Hmm....no MAP sensor where it is pictured to be located, and fcp does not list this part on '98 S70 NA. So vacuum leak or fuel pressure regulator remain suspects. We are heading back to Houston in the morning (2-1/2 hrs) where I will have facilities to check it out. Hopefully this not a car killer i...
by dosbricks
19 Jun 2017, 12:30
Forum: 850 and S70, V70, C70, V70-XC 1992-2000
Topic: At hwy. speed engine stumbles when letting off accelerator
Replies: 12
Views: 3732

Re: At hwy. speed engine stumbles when letting off accelerator

Momentary spike in MAP vacuum when you release pedal: The 98 uses a map sensor, it isn't reacting/reading properly during this moment of what would be the highest vacuum reading seen during normal driving conditions. Or a bad check valve/loose connection/gasket somewhere on the intake side. Though ...
by dosbricks
18 Jun 2017, 19:48
Forum: 850 and S70, V70, C70, V70-XC 1992-2000
Topic: At hwy. speed engine stumbles when letting off accelerator
Replies: 12
Views: 3732

Re: At hwy. speed engine stumbles when letting off accelerator

Thank you for your replies. I swapped in a new fuel pressure relay before changing the fuel pump. Unlike my wagon which has the pressure regulator on the fuel rail, this one is in the rear, so I will have to read up one how to check that. The O2 sensor may be near 100k. The car set the CE light this...
by dosbricks
18 Jun 2017, 09:08
Forum: 850 and S70, V70, C70, V70-XC 1992-2000
Topic: At hwy. speed engine stumbles when letting off accelerator
Replies: 12
Views: 3732

At hwy. speed engine stumbles when letting off accelerator

'98 S70 NA, 230k. When driving in top gear a single intermittent jerky stumble will often manifest with changes in throttle position. The car has lived in flat country all it's life, but we have moved several hundred miles north where it's hilly, and this has become a bothersome issue. The TB is cle...
by dosbricks
20 May 2017, 19:15
Forum: 850 and S70, V70, C70, V70-XC 1992-2000
Topic: 850 fuel tank lock ring
Replies: 18
Views: 3165

Re: 850 fuel tank lock ring

I left the ring off our S70 for about ten days and had no problem re-installing it. I wiped the ring threads with a tiny bit of petroleum jelly and then wiped it off with a paper towel leaving as little residue as possible. I fail to see how exposure to humidity or whatever would cause the threads t...
by dosbricks
15 May 2017, 17:26
Forum: 850 and S70, V70, C70, V70-XC 1992-2000
Topic: Driver Side Windshield Wiper Arm
Replies: 48
Views: 7847

Re: Driver Side Windshield Wiper Arm

Don't bother to grind it,you will get nothing.I tried and it got worse than before. ... It's clear from reading the thread that grinding works for some people but not for others. Start by grinding off a little bit, just a few mm. Observe the surfaces and how removing material should change the angl...
by dosbricks
06 May 2017, 19:09
Forum: 850 and S70, V70, C70, V70-XC 1992-2000
Topic: Driver Side Windshield Wiper Arm
Replies: 48
Views: 7847

Re: Driver Side Windshield Wiper Arm

The problem is caused by the angle of the shaft distorting (wiper motor housing twists with age) just as much as the weakening of the of the arm causing the wiper arm to change geometric s. Notice it is always the driver side arm that is the problem, not the passenger side where the motor mechanism/...
by dosbricks
02 May 2017, 18:07
Forum: 850 and S70, V70, C70, V70-XC 1992-2000
Topic: DIY: 36-mm Axle Nut using floor jack anyone?
Replies: 5
Views: 1231

Re: DIY: 36-mm Axle Nut using floor jack anyone?

Very cool. Why couldn't one use the same method to tighten the nut the final amount using rspi's 60 degree whiteout marks on the socket & rim?