1994 850 MAF bad after cleaning K&N air filter

1998v70xcbill · Post by **1998v70xcbill** » 14 Mar 2015, 22:21

When I had fuel in oil, it was the injector it's self that was leaking. Not injector to manifold. It was gas into manifold. I believe I had starting issues at the time (fuel preesure would bleed down). Would not start at first try, but would start at second try. For rough idle i would look for vacuum leaks.

Post by **rspi** » 15 Mar 2015, 04:00

These cars go to normal idle very fast.

If you are having running issues while cold, I would replace the temp sensor

soulvoid1990 · Post by **soulvoid1990** » 22 Mar 2015, 08:31

firestarterpro wrote:Well, still double check. If you hear any whooshing sound in while the car is running, from under the hood. Its prolly a leak...

I'm definitely going to replace the vacuum lines. Not a hard thing to do, just something I've been putting off. I don't hear any sounds like a vacuum leak, other than the normal sound of the air intake.

soulvoid1990 · Post by **soulvoid1990** » 22 Mar 2015, 08:32

rspi wrote:These cars go to normal idle very fast.

If you are having running issues while cold, I would replace the temp sensor

I actually had this same problem on my 850 Turbo. That was going to be my next guess for hard starts. Only on the turbo, sometimes I couldn't get it to start for days, then it would start perfectly.

soulvoid1990 · Post by **soulvoid1990** » 22 Mar 2015, 08:35

1998v70xcbill wrote:When I had fuel in oil, it was the injector it's self that was leaking. Not injector to manifold. It was gas into manifold. I believe I had starting issues at the time (fuel preesure would bleed down). Would not start at first try, but would start at second try. For rough idle i would look for vacuum leaks.

Not sure if it is something that can be done, but how would you go about finding which injector is leaking? I actually leaning more towards this being the issue with the gas in the oil. There is a very hard tick coming from injector 3, and you can feel the tick in the fuel rail. It's not a valve tick, and it only has the normal volvo clatter, no knocks.

soulvoid1990 · Post by **soulvoid1990** » 22 Mar 2015, 13:42

So as an update, I put the new MAF in today and the car has been driving fine for about 2 hours. I changed the oil, and will keep a close eye on it, and see if it happens again.

I also changed all of the vacuum lines coming from the tree on the throttle body. I wasn't able to change the ones for the air pump, as I don't have a replacement T

. That will get changed shortly though. It does seem to start smoother, and holds the normal cold start RPMs for a few seconds, then drops to just above idle for a min, then idles down, and idles much smoother. There is still a little bit of hesitation coming up from a complete idle, but I noticed my intake hose is cracked/splitting in a few spots, and some of them are large. So that will get changed, and hopefully that will help. Also still going to hollow the Cat out in a few weeks.

I don't have the K&N filter in at this point, just my old paper filter.

Post by **polskamafia mjl** » 22 Mar 2015, 18:02

abscate wrote:I think you will have to bite the bullet and buy a new MAF. It sure seems to be indicated bad and fro others experiences the oiled filters are known to kill them

I think the consensus of the forum is that K&N filters are perfectly safe and an effective upgrade. The key is not to over oil them. There should be an old thread somewhere discussing the cleaning procedure for the K&N's.

Post by **matthew1** » 22 Mar 2015, 18:40

polskamafia mjl wrote:I think the consensus of the forum is that K&N filters are perfectly safe and an effective upgrade. The key is not to over oil them.

Agreed 100%.

Post by **850 LPT** » 23 Mar 2015, 12:19

soulvoid1990 wrote:
850 LPT wrote:I think the key is not to over oil them. I had a K&N filter in my 850 for nearly 200k and never had a problem.
When you oil yours. Do you do both sides, or just one? I only did one side on mine (The outside obviously ) And I made sure to leave it sit for about 30 minutes and then wipe the excess off very good.

Outside only. That's what is shown in their instructions as well:

http://www.knfilters.com/cleaning.htm

soulvoid1990 · Post by **soulvoid1990** » 04 Apr 2015, 10:18

Ok, so, this problem has resurfaced.

I haven't driven the car since I replaced the MAF. I did drive it for about 2 hours around town, and I had 0 problems. Went to start it this morning, as I was going to the garage to change my coolant temp sensor and my wheel bearing. The RPMs are jumping up and down from about 600-1400, doesn't stay running for more then a minute or 2 before stalling, and the cooling fan is continuing to run for about 5 minutes after shutting the car off.

I looked at my previous orders and forgot that I already replaced the coolant temp sensor 8k miles ago when I did my water pump and timing belt. I'm kind of at a loss here as to what is going on.. There are no weird noises/grindings/knocks or ticks coming from anything either.

I'm going to run to Autozone and buy some intake pipe, since mine is cracked and broken in a few spots, hope it helps!

Thanks!

1994 850 MAF bad after cleaning K&N air filter

Re: 1994 850 MAF bad after cleaning K&N air filter