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Date:         Sun, 11 Mar 2001 09:00:26 -0600
Reply-To:     Mark Ingalls <ingalls_mark@HOTMAIL.COM>
Sender:       Vanagon Mailing List <>
From:         Mark Ingalls <ingalls_mark@HOTMAIL.COM>
Subject:      Re: interesting for o2 sens/power loss topic
Comments: To: schmidt5@HSONLINE.NET
Content-Type: text/plain; format=flowed

Or with the digitool you would see what signal the ECU is getting from the 02, as opposed to the signal at the 02 connector.

Two more Cents Worth, Mark Ingalls 85 GL Daily Driver

>From: Schmidt <schmidt5@HSONLINE.NET> >Reply-To: Schmidt <schmidt5@HSONLINE.NET> >To: vanagon@GERRY.VANAGON.COM >Subject: interesting for o2 sens/power loss topic >Date: Sat, 10 Mar 2001 21:48:57 -0500 > >History: 84 westy loses power while driving-top speed 60 if lucky, idled >rough, poor mpg(-all intermitently and symptoms would temporarily resolve >by turning off key). Numerous new parts, AFM cleaning, etc. Exhaust is >all new last year with no cat. > >Hypothesis: This condition will not rear it's ugly head if I disconnect the >o2 sensor. My power will stay within normal limits and my mpg will greatly >improve. Why? I don't know but the van seemed to run better when it was >dc'd, so I ordered a new one. Once the correct new o2 sensor was properly >installed, the syndrome returned. > >Test: (140 mile round-trip to work) The test this week consisted of driving >to work once with the sensor connected, then refueling and driving the same >road with the o2 sensor dc'd. > >Data: trip #1 with o2 sensor connected: 140 miles /9.683 gal= 14.46 mpg >trip #2 with o2 sensor dc'd: 140 miles/ 10.316 gal=13.57 mpg > >One may assume that the van performed better with the o2 sensor properly >connected. Read on!!! > >With the NEW o2 sensor connected, the van would lose power every 10-20 >miles to the point where it would pass nobody, it refused to go faster than >60 mph on level highway, 45-50 on a mild incline and this is with the >accelerater floored. I stopped three times to temporarily breathe some >power back into the beast(by shutting her off), but my average speed >overall was about 60 mph. Idle at stop was crap- one foot on the brake, >one on the gas. > >With the sensor dc'd, I NEVER ONCE LOST POWER IN 3 TRIPS OF 140 MILES >EACH. Further, it idled nice and smooth at a stop, and my average speed >was about 72 mph! > >This van has NEVER gone the 140 miles without the power loss occurring. >Now that the o2 sensor is dc'd, she made it three consecutive trips >flawlessly! Coincidence? Not a chance! > >Conclusion: Disconnecting the o2 sensor cured 2 of 3 problems; namely the >power loss and the rough idle. It did NOT drastically improve mpg as >expected. > >Notes: D/C ing the o2 sensor made a HUGE improvement in the driveability of >the vanagon. I liken it to the difference in driving an old splitty verses >a modern machine. The 02 sensor gives the van that vintage feel of no >power and the constant hope for a downhill grade or a slow semi-truck to >draft. It's kinda embarrassing and I think people snicker at the slow van. >I made every attempt to minimize variables and limit it only to dc ing the >o2 sensor ie same fuel, same road, same everything. >The decrease in mpg with the sensor disconnected is misleading since I was >able to go 72 mph(13.57 mpg) verses 60 mph(14.46 mpg). At less then 1 mpg >difference, I think the fuel economy is actually better with the sensor >dc'd, but I can test that later. >I was truly hoping the fuel economy would improve by dc ing the o2 sensor. >I'd like to know what is "average" for a 84 westy. Average-as in across >the board if you toss out the 10 % that are excessively high and the 10% >that are excessively low. >End result in mpg testing is that when my family goes to Florida next week, >we have to take the 97 Suburban now because the mpg is better...(wife >giving her victory snicker in background). > >Question: If the o2 sensor gives the ecu feedback and (yadda yadda) gives >you the best mpg, AND I am comfortable with the very minimal mpg loss with >it dc'd, can I run without it forever without hurting anything since it >drastically improves the driveability as above??? > >I can't wait to hear the thoughts of the list. >Jay in Seymour Indiana

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