L03----rough idle
03-11-2006, 05:09 PM
#1
Junior Member
Thread Starter
Join Date: Oct 2002
Location: Watertown ,SD
Posts: 42
Likes: 0
Received 0 Likes
on
0 Posts
Car: 91 TRANS AM
Engine: 350 V8
Transmission: 4L60
Axle/Gears: 3.43
L03----rough idle
90 formula with 305 tbi: idling really roughly....?! Changed (Plugs),(pick-up coil),(power brake booster),....the brake pedal is still harder than heck to depress! Could this mean engine woes like; valve spring or valve ----perhaps worse?! -brad
03-11-2006, 06:12 PM
#2
Supreme Member
Join Date: Jul 2001
Location: Palm Bay, Florida, USA
Posts: 3,931
Likes: 0
Received 0 Likes
on
0 Posts
Car: 95 E-150 & 07 Kawasaki ZX-6R
Engine: A slow one & a fast one
Transmission: A bad one & a good one
Axle/Gears: A weak one & a chained one
Major vacuum leak. Check all the lines and gaskets.
03-11-2006, 08:44 PM
#3
Junior Member
Thread Starter
Join Date: Oct 2002
Location: Watertown ,SD
Posts: 42
Likes: 0
Received 0 Likes
on
0 Posts
Car: 91 TRANS AM
Engine: 350 V8
Transmission: 4L60
Axle/Gears: 3.43
Originally posted by Nixon1
Major vacuum leak. Check all the lines and gaskets.
Major vacuum leak. Check all the lines and gaskets.
03-11-2006, 08:46 PM
#4
Supreme Member
Join Date: Jul 2001
Location: Palm Bay, Florida, USA
Posts: 3,931
Likes: 0
Received 0 Likes
on
0 Posts
Car: 95 E-150 & 07 Kawasaki ZX-6R
Engine: A slow one & a fast one
Transmission: A bad one & a good one
Axle/Gears: A weak one & a chained one
Originally posted by sennap1
Could it be that maybe the CAM went south...because of the brake pedal soo damn stiff?....thus creating compression/vacuum issues???????????
Could it be that maybe the CAM went south...because of the brake pedal soo damn stiff?....thus creating compression/vacuum issues???????????
03-11-2006, 08:49 PM
#5
Junior Member
Thread Starter
Join Date: Oct 2002
Location: Watertown ,SD
Posts: 42
Likes: 0
Received 0 Likes
on
0 Posts
Car: 91 TRANS AM
Engine: 350 V8
Transmission: 4L60
Axle/Gears: 3.43
Originally posted by Nixon1
Valvetrain issues are *possible*....but why are you jumping to that conclusion so early? Start with the cheap/simple, and work your way forward.
Valvetrain issues are *possible*....but why are you jumping to that conclusion so early? Start with the cheap/simple, and work your way forward.
03-13-2006, 06:03 PM
#6
Junior Member
Thread Starter
Join Date: Oct 2002
Location: Watertown ,SD
Posts: 42
Likes: 0
Received 0 Likes
on
0 Posts
Car: 91 TRANS AM
Engine: 350 V8
Transmission: 4L60
Axle/Gears: 3.43
Mechanic just told me: he tried a new (map sensor ) to no avail, sprayed (ether) for vacuum leaks-- there were none!, But when he pulled one of the injectors off it ran just fine! He showed me its getting (too much gas) through the injectors. What could be the cause? BTW: there are no codes on his scan tool. 305 TBI. 90' FORMULA......ALSO... the diaphram in the tbi unit checked out ok too....
Last edited by sennap1; 03-13-2006 at 06:07 PM.
03-13-2006, 07:25 PM
#7
Supporter/Moderator
iTrader: (7)
Join Date: Feb 2001
Location: Cincinnati, OH
Posts: 13,240
Likes: 0
Received 390 Likes
on
297 Posts
Car: '90 RS
Engine: 377 LSX
Transmission: Magnum T56
Have you checked the CTS and O2 sensor? A bad CTS and O2 can cause the ECM to dump all sorts of fuel at the motor if it is receiving a false lean condition. O2's are cheap so I would replace that just for the sake of preventative maintained. Your CTS can be checked with a thermometer, hot water, ice water and an Ohm meter. You can match up your recorded Ohm values and compare them to a chart. The chart is here on TGO but the search function is down. Perhaps you can find them on the net.
Thread
Thread Starter
Forum
Replies
Last Post
