SPONSORED LINKS

SAAB wont rev past 4000 when driving!

Tiny
MYINVESTMENT
  • MEMBER
  • 1998 SAAB 9-5
  • 155,000 MILES
Hi, can you tell me why my saab 9-5 wont rev past 4000 when driving? It starts and drives fine plenty of power but it wont rev past 4000 rpm so losing power somwhere:Speed reaches 80mph max. Had new cat, oxygen sensor, fpr, full service regular. Help! Its not in limp mode.
SPONSORED LINKS
Tuesday, November 1st, 2011 AT 5:52 AM

11 Replies

Tiny
MHPAUTOS
  • MECHANIC
  • 31,938 POSTS
Manual or auto and does it sound as if it is choking or it is breaking down and missing under load at all?
Was this
answer
helpful?
Yes
No
Tuesday, November 1st, 2011 AT 7:10 AM
Tiny
MYINVESTMENT
  • MEMBER
  • 16 POSTS
Hi,
its a manual. No its not choking no feeling of it breaking down. It seems to take a while to climb the speedo example: 50 - 70 takes ages plus its limit seems to be 80mph on the flat road.

It runs great up to that limit but cant seem to surpass the 4000 rpm range got power from 3rd-4th then it drops off. Climbing a good hill it will drop to about 55 from 80 which baffles me.I suppose you could say the top end power bogs down.

Thanks for replying.
SPONSORED LINKS
Was this
answer
helpful?
Yes
No
Tuesday, November 1st, 2011 AT 10:11 AM
Tiny
MHPAUTOS
  • MECHANIC
  • 31,938 POSTS
Check that you are actually getting full throttle at the throttle body with the pedal on the floor.
Was this
answer
helpful?
Yes
No
Tuesday, November 1st, 2011 AT 11:34 AM
Tiny
MYINVESTMENT
  • MEMBER
  • 16 POSTS
Can you tell me what to look at when im doing that. Do I need to look into the throttle body? Should the throttle open fully?
Sorry just need to get it right.
Thanks.
Was this
answer
helpful?
Yes
No
Tuesday, November 1st, 2011 AT 12:04 PM
Tiny
MHPAUTOS
  • MECHANIC
  • 31,938 POSTS
OK, presuming that it is a cable throttle? I don't have access to my data base just now, with the pedal fully down, check that the throttle plate is fully open, let me know if it is drive by wire (no cable) I will have to check for the test for that system, do not open throttle plat by hand if it is not a cable system, you can damage the drive motor, you can with a cable throttle.
SPONSORED LINKS
Was this
answer
helpful?
Yes
No
Tuesday, November 1st, 2011 AT 12:26 PM
Tiny
MYINVESTMENT
  • MEMBER
  • 16 POSTS
There is a cable to the throttle body. Im going out to work now but will check that later and I will let you know.
Thankyou for taking the time to help me out its appreciated
thanks.

If it is the throttle not opening fully can it be adjusted by myself?
Was this
answer
helpful?
Yes
No
Tuesday, November 1st, 2011 AT 12:30 PM
Tiny
MYINVESTMENT
  • MEMBER
  • 16 POSTS
Ive just found out its fly by wire on the saab 9-5 throttle.
Thanks.
Hope this helps
Was this
answer
helpful?
Yes
No
Tuesday, November 1st, 2011 AT 12:33 PM
Tiny
MHPAUTOS
  • MECHANIC
  • 31,938 POSTS
Do not touch then, I will see what I can find out.
Was this
answer
helpful?
Yes
No
Tuesday, November 1st, 2011 AT 12:38 PM
Tiny
MYINVESTMENT
  • MEMBER
  • 16 POSTS
Thankyou.
Was this
answer
helpful?
Yes
No
Tuesday, November 1st, 2011 AT 12:39 PM
Tiny
MHPAUTOS
  • MECHANIC
  • 31,938 POSTS
A diagnostic scan will show up any problem with the throttle position switch and the throttle motor.
Was this
answer
helpful?
Yes
No
Tuesday, November 1st, 2011 AT 1:00 PM
Tiny
MNTHNY4
  • MECHANIC
  • 612 POSTS
If after checking for any throttle body related codes & there is non, then the problem may now be with the vehicle ECM [engine control module] [computer] having internal fault, taking note that u have checked all turbo related components, fuel pressure & blockage in exhaust CAT, good luck.
Was this
answer
helpful?
Yes
No
+1
Wednesday, November 2nd, 2011 AT 8:45 PM

Please login or register to post a reply.

Related Engine Low Power Content

Fix an Engine with Low Power!
VIDEO
Fix an Engine with Low Power!
Instructional repair video
Symptoms of Low Engine Power
GUIDE
Symptoms of Low Engine Power
The power your car's engine is producing is important. When you step on the gas you need your car to accelerate, mainly to keep you out of trouble when getting onto the...
VIEW MORE

Sponsored links