reduced power/restricted performance
Guest
Posts: n/a
reduced power/restricted performance
I have a 2003 "S" type it has 59000 mi.was running fine one day the next day running rough,the little engine warning light stays on, you accelerate. If you push it too hard the other amber light comes on and the car will start cutting out. the book says limp home mode.The dash screen says "restricted performance" I took it to the dealer in Palm Springs CA. They did the diagnostic on it.Thier concluclusion was a broken intake air box "bolderdash" there is nothing wrong with the box. Also the MAF air sensor was bad.I bought a new sensor and installed it even though I had my doubts. The car still perform badly, just as before. Is there some sort of reset?? or do I have other problems, like looking in the wrong place. Guys I sure need help....Thanks RonM
[/align]
[/align]
Guest
Posts: n/a
RE: reduced power/restricted performance
Jagmaster--Got hold of the service writer. He was able to give me the numbers-- you hit the nail on the head the codes were-- po171 and po174 haveing to do with a lean mixture.I have already replaced the air temp sensor at the air filter box.Car still acts the same.Thanks RonM
[/align]
Trending Topics
Joined: Jan 2007
Posts: 26
Likes: 0
From:
RE: reduced power/restricted performance
check for vacuum leaks and also check your fuel pressure. a common problem that we see, i am not saying that this is your problem, is that the mass air flow sensor shorts out. it reads 2 things. Barometric pressure and airflow to the engine. if you can check all these things i bet you will find your problem. if there is no vacuum leaks andfuel pressure is good (i have seen a few bad fuel pumps as well) then i would suspect a faulty mass air meter.
Guest
Posts: n/a
RE: reduced power/restricted performance
Jag Master The last five of the Vin.# M47398. The part recommended by the dealer is02C252670 I installed it and it didn't make a bit of diff. I bought an Actron Code reader supposed to be the top of the line. I find it interesting that the codes the dealer gave me were po171 and po172.The codes off the new reader are(1) PO300 random multiple cyl.misfire.(2)PO304 cyl 4 misfire.(3) PO305 cyl 5 misfire (4)P1313 manufacture control ignitions systems or misfire.(5) P1316 manufacture control ignition system or misfire. P1000 pd manufacture control fuel & air metering,aux emissions controls. This sounds a lot more like my problem than theother. Thanks again RonM
Member
Joined: Aug 2012
Posts: 71
Likes: 4
From: mishawaka, in
Re restricted performance
check for vacuum leaks and also check your fuel pressure. a common problem that we see, i am not saying that this is your problem, is that the mass air flow sensor shorts out. it reads 2 things. Barometric pressure and airflow to the engine. if you can check all these things i bet you will find your problem. if there is no vacuum leaks andfuel pressure is good (i have seen a few bad fuel pumps as well) then i would suspect a faulty mass air meter.
When I got the STR someone had take the K & N out and stuck a cheap genaric filter. I replace the filter with a K & N also the breather hose was broken so I replace it. The car runs fine but I was able to pull the p0171 and p0174 codes of my odb meter. Seems like this type of problem is almost trial and error until you find the culprit?
Veteran member
Joined: Jan 2009
Posts: 3,390
Likes: 195
From: Akron, Ohio USA
I too have the same problem as I did with my 2001 VDP. The VDP was a simple matter of coils on bank 1 and bank 2.
When I got the STR someone had take the K & N out and stuck a cheap genaric filter. I replace the filter with a K & N also the breather hose was broken so I replace it. The car runs fine but I was able to pull the p0171 and p0174 codes of my odb meter. Seems like this type of problem is almost trial and error until you find the culprit?
When I got the STR someone had take the K & N out and stuck a cheap genaric filter. I replace the filter with a K & N also the breather hose was broken so I replace it. The car runs fine but I was able to pull the p0171 and p0174 codes of my odb meter. Seems like this type of problem is almost trial and error until you find the culprit?
Veteran Member
Joined: May 2009
Posts: 12,068
Likes: 3,358
From: home
Please do some searching on this forum for your error codes. You have a very common problem and there are excellant write ups on what to do. No need to rehash everything every time.
Have you checked the FAQ's?? Very good stuff.
.
.
.
Have you checked the FAQ's?? Very good stuff.
.
.
.
Junior Member
Joined: Feb 2012
Posts: 7
Likes: 1
From: Espoo Finland
I also got the same malfunction..
I have STR 4/2003, 90 tkm on the clock. Last Saturday I changed engine oil and oil filter. I also changed fuel filter. Both filters were Crossland i.e. not original, Today I got restricted performance and amber engine light illuminated.
I just wonder if the aftermarket fuel filter might cause this malfunction ?
Best regards
Jussi
I just wonder if the aftermarket fuel filter might cause this malfunction ?
Best regards
Jussi
Veteran Member
Joined: Feb 2009
Posts: 8,020
Likes: 1,731
From: Sunny South Carolina
Doubtful about the fuel filter. Are you sure you put it in with the flow arrow pointing in the right direction?
Get the codes read and post back.
While your at it update your signature with vehicle details, real easy to do.
Get the codes read and post back.
While your at it update your signature with vehicle details, real easy to do.
Thread
Thread Starter
Forum
Replies
Last Post
Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)