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Old 12-11-2000, 07:08 AM   #1
Travis R
Scooby Specialist
Member#: 153
Join Date: Aug 1999
Location: Austin, TX
'07 Mazda CX-7, '91
BMW 535i & '06 Ninja 650R

Question need help diagnosing a lurching problem

Over the last few days my MY99 RS has developed some kind of hiccup. When I'm accelerating hard in second or third gear the car will hesitate randomly. It feels exactly like the fuel starvation problem we some times encounter while cornering, except that I'm traveling in a straight line. I was thinking that it could be a number of things, but I could always use a few more oppinions.
The car has a little over 40K miles on it. I haven't replaced the fuel filter yet or the spark plugs, so they might help. The other thing I thought it might be was the MAF. The last time I cleaned and re-oiled my K&N panel filter I don't think it was totally dry before I reinstalled it and had to go. So could it be that some of the filter oil has gotten onto the hot film and is screwing things up? I remember a post a long time ago that mentioned using some electronics cleaner that came in a spray can to clean the MAF wire. Does anyone remember what that stuff is? (I'll try a search)
If I'm going to replace the fuel filter I'm going to have to de-pressurize the fuel rails, right? How do I go about doing that, any tips?
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Old 12-11-2000, 09:13 PM   #2
Scooby Guru
Member#: 114
Join Date: Jul 1999
Chapter/Region: MWSOC
Location: Wichita, KS and Whoring, OT
'03 Evo, Rice White
'01 Erion CBR 929


Definitely replace the fuel filter.

Quick way to depressurize the fuel system:

1. disconnect battery
2. unscrew gas cap (woosh)

The Haynes manual outlines like 2-3 other steps but I find these two to be sufficient.

Shame on you on the fuel filter-- that's a 30k maintenance item I believe. A very dirty one could certainly cause the problem you have.

The plugs wouldn't, but I guarantee you will notice a difference in idle quality and probably performance in replacing them. I like Bosch platinum-- easy to find in the stock heat range, cheap and effective. I also like ND and NGK copper but they're not as easy to find in stock, at least at stores near me.

Good luck.
ColinL is offline  
Old 12-12-2000, 07:43 AM   #3
Scooby Specialist
Member#: 2348
Join Date: Sep 2000
Chapter/Region: MWSOC
Location: St.Louis
2006 WRX TR
Steel Grey Metallic


The fuel filter makes the car feel entirely different. Also re-set your ecu. I haven't done my plugs yet (32k miles) But I will soon. Definitly do the filter, its 26 bucks from the dealership, Subaruparts.com or Teagues might have it for cheaper. It only takes 10 minutes to do, the toughest part is removing the fuel lines.
STiShawn is offline  

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