Ok. let's start with the air/fuel gauge. It shows lean when driving along the same rpm. When give it some throttle it jumps to rich and down just as fast. Datascan shows that both 02 sensors jumps when I give it throttle. But the 02 sensors stays at the bottom when driving along and does not respond before I tap the throttle again. IS THE AIR/FUEL GAUGE SUPPOSED TO SHOW LEAN WHEN DRIVING??

 

though it should show optimal.. the old spark plugs were black because of overfueling. Could this have damaged the o2 sensors somehow?

 

The car also hestitates when driving along... it responds like when you run out of gas. Fine when I push down the throttle and accelerate?, but the hesitation returns when driving along at the same rpm.

 

I have change the PTU, spark plugs and coils. Had a major hesitation problem before changing the spark plugs. Think I might have a vacum leak somwhere around the back of the engine. It's hissing...

 

Can provide a running datascan log file if someone wish...

The car also hestitates when driving along... it responds like when you run out of gas. Fine when I push down the throttle and accelerate?, but the hesitation returns when driving along at the same rpm.

 

Mine did exactly that when the fuel pump was on it´s way out

Don't think it's the fuel pump. Wouldn't that cause hesitation when giving it more throttle also. Because the hesitation stops as soon as I give it more throttle and accelerate.

Edited August 23, 200817 yr by trond

Seems like I got a plenum gasket leak. A lot of hissing from the rear top of engine around the gasket. Don't know what you call it but a direct translation from norwegian would be start gas. Tried spraying that where the leak might be but got no response.... shouldn't that cause a rise in rpm.

May be a stupid question, but is there som vacum system under the plenum gasket that could cause the leak?