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| Poor MPG Advice Please http://www.lostjeeps.com/forum/phpBB3/viewtopic.php?f=5&t=86137 |
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| Author: | Old-Bugga [ Wed Feb 15, 2017 3:51 pm ] |
| Post subject: | Poor MPG Advice Please |
Hi Guys. I am a U.K. Owner of a 2.8crd. Evic tells me I am getting 19mpg. I don't drive like a lunatic. What I have done so far is....replaced the thermostat, and have just removed and carefully cleaned the MAP sensor. New air filter and oil change also done. What else's should I be looking at? |
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| Author: | mass-hole [ Wed Feb 15, 2017 3:55 pm ] |
| Post subject: | Re: Poor MPG Advice Please |
You could check for a dragging rear brake. |
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| Author: | Old-Bugga [ Wed Feb 15, 2017 4:05 pm ] |
| Post subject: | Re: Poor MPG Advice Please |
I do suspect I have a wheel bearing on its way out. She sounds like the Star Ship Enterprise accelerating and if I turn the wheel the noise gets worse. |
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| Author: | GordnadoCRD [ Wed Feb 15, 2017 4:14 pm ] |
| Post subject: | Re: Poor MPG Advice Please |
Before I believe EVIC readouts of mileage, I prefer to verify the odometer by checking against known point to point drives, and track the actual fuel used. Some are surprisingly far off. Had a Saturn Vue that read 17% high over a month's average, even though the odometer and speedometer were dead on as close as I could measure. |
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| Author: | papaindigo [ Wed Feb 15, 2017 5:17 pm ] |
| Post subject: | Re: Poor MPG Advice Please |
Wheel bearings and/or dragging front (pad hung on pins and dragging on rotor) or rear (emergency/parking brake) brake could be it. EVIC is not known or accuracy and just gets worse with tires that are not stock size and/or under inflated tires. Winter fuel can cut mpg as can higher ratios of biofuel. Shortish drives especially in winter kill mpg (say under 10 miles at average of 25 mph). Also consider the EVIC reading is likely mpg based on US gallons not Imperial gallons. If so 19mpg is not bad for winter in town driving absent a GDE tune. As noted 1. pick a fuel station and fill up until unfoamed fuel is visible at the top of the filler neck and zero out your trip odometer 2. drive at least 250 miles as you normally would 3. at some point during the drive use a GPS to check odometer accuracy; ideally on a 25 or so mile stretch of reasonably straight road. 4. return to same station and ideally same pump; refill to same level; 5. hand calculate mpg (US mile - IIRC UK pumps are calibrated in litres so be sure you do the conversion correctly) based on fuel used and actual miles driven (GPS corrected if needed) Normal mpg (US) for a KJ CRD 05/06 that does not have a GDE tune is 18-19 city and 25-27/28 hwy. City = flatish roads, max speed 45mph, average speed 25 mph, travel distance 10-15 miles from start to stop at work, ambient temps above 65F. HWY - limited access, flatish roads, no significant wind, w/wo AC, speed ca. 60-65 US mph (note assumes at those speeds your are running ca. 1800-1900 rpm) |
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| Author: | Old-Bugga [ Thu Feb 16, 2017 4:57 pm ] |
| Post subject: | Re: Poor MPG Advice Please |
Got to say that simply cleaning the MAP sensor seems to have made a very noticeable difference to how responsive the car is. Seemed to have much livelier acceleration today. Am I just wishing it better? Got a new fuel filter ordered. Mine seems to have a Rocal R20s fitted. |
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