Last post on Oct 24, 2013 at 3:14 PM
You are in the Volkswagen Passat
What is this discussion about?
Volkswagen Passat, Sedan, Wagon
#8226 of 8276 engine sludge is only for 1.8T engine?
Jul 12, 2009 (7:22 pm)
is that 1.8T engine the only one met sluge problem? Does anyone meet this problem with a 05 TDI engine? Thanks.
#8227 of 8276 Diminishing Fuel Economy
Jul 13, 2009 (3:46 pm)
Own a 2003, 1.8T, 60K miles. Gas mileage has declined about 25% in last year. Car runs perfect and even had VW look at it. Found nothing wrong. Use Premium gas. Any ideas?
#8228 of 8276 Re: Diminishing Fuel Economy [tomj2]
Jul 14, 2009 (6:22 am)
I was told to always use premium gas. Check your manual. I owned a v6 GLS wagon. Your turbo will be effected even more. You should see significant drop in HP
#8229 of 8276 Re: Diminishing Fuel Economy [jasonallison]
Jul 14, 2009 (7:11 am)
Thanks for reply, Jason. I've always used premium but it has still lost fuel economy.
#8230 of 8276 question for tomj2
Jul 14, 2009 (8:31 am)
Have you changed tires?
What about air filter?
Stuck hand brake?
I think I run out of ideas.
PS One more: different oil?
#8231 of 8276 Re: question for tomj2 [krzyss]
Jul 14, 2009 (3:40 pm)
No to all of the above. VW checked it over. I figure that as a dealer, they were dying to find something wrong...
#8232 of 8276 Sludge question
Jul 14, 2009 (6:33 pm)
So if there is a Passat that did have some sludge issues at 45k miles and the dealer found oil output was low and replaced the oil pump, assuming from here on out all future oil changes will be done in a timely manner with appropriate synthetic oil, any reason to be concerned about the engine's future?
#8233 of 8276 Re: Diminishing Fuel Economy [tomj2]
Jul 15, 2009 (2:58 am)
O2 sensors going bad?
Thermostat not fully closing?
Vacuum leak somewhere?
At some point, all these can occur and not show up on the OBD2.
#8234 of 8276 Re: Diminishing Fuel Economy [altair4]
Jul 15, 2009 (6:01 am)
Those are reasonable questions. May be worth looking into although I would hope VW would have picked them up. Would a bad O2 sensor cause it to fail an emissions test? It passsed a few months back.
#8235 of 8276 Re: Diminishing Fuel Economy [tomj2]
Jul 16, 2009 (7:05 am)
What I understand is that the O2 sensors deteriorate. They slowly fail, versus an "on-off" issue. They could still be within the range of "acceptable" but not giving the most accurate signal. Hey, I'm just guessing!
BTW, the web is full of stories where one would have hoped that "VW would have picked them up. Personally, I think they rely too heavily on the "there's MIL, so all must be perfect" approach to troubleshooting.