Engine studder below 2000 RPM

Was gonna suggest perished vacuum line.. along Warps thinking on MAP pressure, but you've checked them.

Original air ducts or triple filters? might be worth changing to triples if original ducts, incase there's a blockage or leak in the old system?
 
Thats one way or pull yours plug her and shut the O2 sensor down reset adaptations and take her for a spin. You could also load a map in it that has the sensor shut off to test it. if it makes a difference then you can just leave it out or change it for a wide band system.
 
you sound that way inclined - does it 'feel' like an ignition or fuelling problem?
 
It acts like an old carburetor with a clogged idle jet (if that make sense). If I am gentle with the throttle from idle to over 2000rpm, there are no issues. If I'm aggressive under 2000rpm it hesitates and studders until I get over 2000rpm.

The really odd part is that nothing has been wrong for 80,000 miles. So I would think that the problem is a wear item.

My friend left town for a few weeks, so I don't have access to the RIII Touring for troubleshooting. I hate the the service manual doesn't provide readings for all the sensors, so I don't have a reference to compare the tuneboy readings.
 
And did it come on suddenly or did it develop from good to as it is now gradually?
 
The symptoms cam on suddenly but intermittent. She would run fine for a week or two then the symptoms came on suddenly with the same severity every time. Now its constant.
 
I read that you have check all of the wiring (O2 sensor).
Electric is good.
Gas is good.
It sounds so much like an AIR problem. Without a strong air draw, the engine would shudder.
Also, if it is stuttering, try turning it off and then restart. A few seconds off is enough.
I have had this happen and the off/on must have reset the barometer reading (air ambient pressure).
Might not be your problem but it might. After that I think there is an air pressure sensor that might be sending a bad/false signal.
There is a sensor on the intake manifold that may be dysfunctional.

Remove then and clean and replace, or replace.

I also believe in SEAFOAM flush. Great stuff for the fuel lines, start to finish.
 
hinglby said:
The symptoms cam on suddenly but intermittent. She would run fine for a week or two then the symptoms came on suddenly with the same severity every time. Now its constant.
Click to expand...

Sounds like fault in electronics
 
You must log in or register to reply here.

Similar threads

Valve noise below 1700 RPM, what can cause this?
Replies
7
Views
476
warp9.9
Storm Gt hill hold not available and engine light on.
2
Replies
11
Views
286
Kiwicol
Anybody recall the Germain engine guards name?
Replies
3
Views
246
Mongler07
R3T and Roadster engine differences...
Replies
7
Views
704
1olbull
Engine Question
Replies
6
Views
626
Ham42
Menu
Log in
Register