[phil.]

looks like the gremlins are coming out to play. 06 HSE, 78.5k miles

1. radio acting up - seems like if i leave it on sirius, drop kids off at school, then hop back in the car, radio shows "no service". if i hit another preset station, it picks it up, but then i have to go back to the original station i left it on. workable, but annoying.

2. reduced engine performance. this one has me more worried. came up on the display this morning. it's colder than it's been all week, but at 46F, shouldn't be a problem. after dropping kids off at school, the message came up soon after i started up to make the 7 mi return drive home. halfway back, message went away. but as i pulled into my driveway, the RRS stalled?! i was able to start it up again and pull in.

ideas? still on the original battery. perhaps it's about to croak?

 

[gooseyloosey]

still on the original battery. perhaps it's about to croak?

I think you're right on and I'd start there--3+ yrs is pretty good. I have found this vehicle is very sensitive to low battery voltage.

If you want to verify, test your battery with a voltmeter first thing in am before starting car(or after its been sitting for a day) and then right after you run it. A rough idea is that a delta of 0.5V over 24hrs is a sign that things are going downhill...and you may not want to leave the car at any airport parking lots for a week

 

[umbertob]

1) I have had similar problems occasionally with Sirius, but then they go away... I think it's a matter of some terrestrial repeaters being down at times, temporarily affecting reception in some areas.

2) My money is on a bad MAF sensor. I had an almost identical instance about 6 months ago: While driving on an uphill stretch of a local freeway at high speed the Reduced Engine Performance fault message popped up. I didn't lose any power and after about 5 minutes the message went away on its own. But, as I reached my destination and pulled into a parking lot the engine stalled and died. Restarted and ran fine after that. I pulled the air sensor and cleaned it with some electrical contacts cleaner - it was encrusted with dirt, probably from all my off-road trips. Still, it made me wonder about how effective our air filters really are! I have since found out that you can actually buy MAF sensor cleaners: http://the-auto-alley.amazonwebstore.co ... J19XSA.htm

Anyway, cleaning it worked for a while - or so I assumed - but a couple of months ago I got the message again (although the engine didn't stall, idle was a bit rough until I restarted it, then it was all good again.) I had the car scheduled for a front shock replacement anyway and asked the indy shop to check if there was a Diag. Trouble Code stored. Sure enough, DTC matched: "Faulty Air Mass Meter". I told them to replace the unit this time. About $120. My suggestion is, try and clean it first (#20 Torx driver required to remove it.) If the problem reoccurs buy a new one, takes 2 minutes to replace. Part # PHF000140. I took a picture of my defective sensor:

 

[gooseyloosey]

Good point on the MAF Umberto.

Wrt the Sirius problem, I've never encountered that on the East Coast. Must be the repeaters are always moving around with the Earth's crust out there in CA and the satellites have to relocate them.

 

[ChipN]

The Sat radio in mine loses signals where others don't. I just figure it has a poor antenna and it takes a a couple of seconds to bring each station which makes surfing channels kind of a pain. I get service in my garage but not sitting under a Cottonwood tree. I don't think the stereo separation is as good as it is on as FM either. But it works and I can't live without it in the West out here.

 

[phil.]

thanks for the tip on the MAF. it threw the mysteriously appearing/disappearing reduced engine performance message again yesterday, but didn't stall out so i picked up some MAF cleaner today. i'll let you know how it goes.

 

[O-Town]

Re: Engine Performance Reduced
by O-Town » Thu Aug 06, 2009 4:06 pm

Earlier this week I got the dreaded "engine performance reduced" message heading to Tampa on I-4, I went from 85 to 55mph and it wouldnt go any faster
PT Crusier's Ford Escort's were passing me Took it in to the dealer and it was the Supercharged Cooling Pump, they replaced it under warranty and now its better then ever at 38,000K and I am back in the passing lane lol

 

[phil.]

update: no reduced engine performance message, but it was running sluggishly from SF to home (about a 20 mile drive) and mysteriously stalled in front of the house tonight. guess that MAF cleaner didn't help and i'll be replacing it.

 

[vinniman]

Gents.

This sounds familiar with all Jag AJV8 model RRS's - might even be a vacuum leak with engine stalling issues you are having ? ?

Are you blokes running the same grade engine oil, as I've also noticed with alloy block units they're very sensitive to oil weight !

If a check engine light/reduced engine performance message is flashing there could also be problems with the oil pickup sensor.

Cheerio,


Vinniman
'88 Highline
Perth, W.A.

 

[geflackt]

SATELLITE radio:

I've had the same issue - turn on and can't find the station. Switch to another preset and back and things are fine. I'm on the East Coast. The system also seems very sensitive to trees and other obstructions, more so than the antenna we have on the Disco. We have a lot of woods around where we live, so most of the time near home I switch over to CD. This is on an '06 RRS.

I've also noticed that if the Bluetooth is used, then I exit, go to Sat or CD, then to AM(news, 1060), the AM won't work unless I bump to another mode and back to AM. Bluetooth exit to AM is fine, but if I go to another mode and back to AM, AM needs to be cycled again.

I figure it's just a glitch I'll live with for now.

 

[Hommerun]

thanks for the tip on the MAF. it threw the mysteriously appearing/disappearing reduced engine performance message again yesterday, but didn't stall out so i picked up some MAF cleaner today. i'll let you know how it goes.

Looks like its been a while since this thread was posted to. I just got a 2006 RRS with 55K miles. Off warranty now. First day out, REP message pops up. I get it into the shop and the MAF bulletin catches their attention. Replaced. On the drive home...bingo. REP message. Now I get it almost every day. No noticeable hit to performance. Just the message. Strangely, it happens most often when I'm doing 30mph...down the hill heading toward my house. Its not a steep incline. but it happens every time. I can't figure it out. Going back to the shop. I'm a bit annoyed that the MAF swap didn't fix it.

 

[phil.]

it kept happening to me after the new MAF, but less often. oddly enough, REP started coming up again last week so i brought it up to the dealer when they did my stereo software upgrade. unfortunately, LR extended warranty doesn't cover troubleshooting time so they didn't dig around too far. SA noted the throttle body was pretty dirty. i checked it out when i got it home and it wasn't that bad, but i cleaned it out anyway. it's been about a week and so far so good.

 

[umbertob]

I was going to suggest the throttle position sensor as well, especially if the REP message regularly pops up as you are coasting downhill (Hommerun), it would make more sense than a dirty MAF sensor. If they determine that's the cause, the position sensor is part of the throttle body and cannot be replaced individually, I'm afraid. The throttle body looks easy enough to replace on your own, although the shop manual also recommends resetting the adaptive transmission (something only a shop can do via diagnostics) to minimize chances of a jerky ride after replacement.

 

[Hommerun]

I was going to suggest the throttle position sensor as well, especially if the REP message regularly pops up as you are coasting downhill (Hommerun), it would make more sense than a dirty MAF sensor. If they determine that's the cause, the position sensor is part of the throttle body and cannot be replaced individually, I'm afraid. The throttle body looks easy enough to replace on your own, although the shop manual also recommends resetting the adaptive transmission (something only a shop can do via diagnostics) to minimize chances of a jerky ride after replacement.

I am back with the rover and here's the diagnosis:

Code P010-00 MAFS or small air leak - since MAFS was replaced, the found a leak in the EGR valve. Replaced valve, ran tests and found software was out of revision so updated for engine and transmission.

Dealer was very accommodating. Took their time to diagnose, comped me a rental car, comped me several hundred $$ in labor.

I am pretty sure I've gotten all the kinks out of my acquisition. Car is registered. Plates are on. Set of new General Grabber UHP 19" tires addes. A total vehical inspection (done free of charge by the LR dealer) and the issue with the REP message inducing problems + a terrific detailing at a local shop.

I'm happy!