98 S70 GLT Perfectly fine, now won't start/idle

Post by **jblackburn** » 15 Jun 2010, 10:02

Whoops, I apologize for never following up on this thread.

If your fuel filter is completely blocked, as it could be by something sucked up in bad gas, you will see little to no pressure at the engine. You should, however, still hear the fuel pump running.

You can relieve the fuel pressure, if there is still any left, at the right side of the fuel rail. There is a blue cap that you can unscrew and press on the valve at the end. Then you should be fine to replace the filter.

Duake · Post by **Duake** » 16 Jun 2010, 13:02

I replaced the fuel filter. Pretty easy on the S70. Only thing is... it didn't solve the problem.

I turned the key to the II position and went to the engine to hear the pump. It just buzzed the whole time, so I took the cover off. I then smacked it with my screwdriver and the buzzing quieted down a little, but it was still there. I tried to start it, but same thing. I smacked it a couple more times (not hard, mind you) to see if something may have just jostled loose or something (ie. connection or something). I started the engine again and it seemed to do the job for a little bit. I went to the engine and after about 10-15 seconds, it started idling REALLY bad and the entire engine was bouncing around, which meant it was going to die. It did.

At least now, I know what is going on. It HAS to be the fuel pump. Is it possible to take the thing apart to clean it and/or inspect it? I'd rather take the thing apart and clean it myself instead of replacing the whole thing. Thanks!

Post by **jblackburn** » 16 Jun 2010, 13:08

Wait hold on a sec...

The buzzing thing under the HOOD is the idle control valve. The shiny metal cylinder with 2 pipes coming off of it under the black cover. That's what I got from reading that, anyway. It is possible for that to be bad (or stuck), and your car won't start/idle.

If that's the case, take it out and spray some carb cleaner straight through it to free up any stuck-up crud inside.

These cars only have 1 fuel pump, and it is in the trunk over the fuel tank. They're normally pretty quiet, and if you smacked it and it worked, than it is indeed on its way out.

Duake · Post by **Duake** » 16 Jun 2010, 13:12

jablackburn wrote:Wait hold on a sec...

The buzzing thing under the HOOD is the idle control valve. The shiny metal cylinder with 2 pipes coming off of it under the black cover. That's what I got from reading that, anyway. It is possible for that to be bad (or stuck), and your car won't start/idle.

If that's the case, take it out and spray some carb cleaner straight through it to free up any stuck-up crud inside.

These cars only have 1 fuel pump, and it is in the trunk over the fuel tank. They're normally pretty quiet, and if you smacked it and it worked, than it is indeed on its way out.

So it was the idle control valve that I smacked? The thing that has the rotary mechanism with the steel wires that you can rotate to accel or kill the engine? It has some pretty tight, small clamps on it. I can take a pic of it, but how would I post it? Guess I'd need to put it on Image Shack or something right?

Post by **jblackburn** » 16 Jun 2010, 13:25

This is what you're talking about I think?
https://www.matthewsvolvosite.com/forums ... &mode=view

Just under the box where you type to reply to a post, there are two tabs. Hit the upload attachment one and upload your picture if you still need clarification.

Duake · Post by **Duake** » 16 Jun 2010, 13:27

That's exactly what I'm talking about! It buzzes something fierce until I tap it a little bit. How do I get the thing off?

Post by **jblackburn** » 16 Jun 2010, 13:38

It has annoying Oetiker clamps on the hoses - I grab them with a pair of pliers and give em a good twist. Be careful with the top hose - mine was very brittle and broke, and it's not a normal size/shape.

Then the cylinder itself is just held in with a rubber grip. Tilt it towards the front of the car, and that end will pop out.

Grab some new smallish screw clamps at the auto parts store, and a can of carburetor cleaner. Spray that through it til it starts running out clear again, and it should be clean. Then you can see if it will work again or if you need a new one.

Duake · Post by **Duake** » 16 Jun 2010, 13:58

So if I take it apart, nothing will drip or flow out of it? Also, would engine degreaser work instead of carburetor cleaner? I already have it, so that's why I'm asking. Thanks again!

Post by **jblackburn** » 16 Jun 2010, 17:02

The only thing that goes through those tubes is air from the turbo. I wouldn't use that stuff on it honestly, and since you are going to have to buy new clamps, just spend the extra $3 and get some, hopefully it will keep you from having to buy a new part

Duake · Post by **Duake** » 24 Jun 2010, 11:20

I took that thing apart and cleaned it. The car still does it's start up for a second and then just dies. It's almost like something is blocking fuel from getting somewhere or something. I can only think of the fuel pump as I have replaced the fuel filter and the caps on the fuel filter relay.

How do I take the fuel pump out and clean it and/or see if that's the problem (ie. take it to a shop or something)? I'd rather do this myself because I have no money to get it towed or fixed at a shop right now. Thanks!