Odd Idle
Senior Member
Joined: Jan 2003
Posts: 2,871
From: London, Ontario
Revs up and down like you are blipping the throttle?
If so, I would say a vacuum leak or your idle screw is not closed enough. 1.2 K idle is too high. Mine would do the 1 -1.5K bounce then settle around 1.2K after adjusting the idle screw as far as it would go to compensate for a very rich idle (too much fuel pressure from manual FPR). It would also bounce like that if the PCV hose blew off under boost.
If so, I would say a vacuum leak or your idle screw is not closed enough. 1.2 K idle is too high. Mine would do the 1 -1.5K bounce then settle around 1.2K after adjusting the idle screw as far as it would go to compensate for a very rich idle (too much fuel pressure from manual FPR). It would also bounce like that if the PCV hose blew off under boost.
Senior Member
Joined: Nov 2002
Posts: 517
From: Orlando
Originally Posted by TYSON' date='Jun 4 2003, 05:16 AM
Revs up and down like you are blipping the throttle?
If so, I would say a vacuum leak or your idle screw is not closed enough. 1.2 K idle is too high. Mine would do the 1 -1.5K bounce then settle around 1.2K after adjusting the idle screw as far as it would go to compensate for a very rich idle (too much fuel pressure from manual FPR). It would also bounce like that if the PCV hose blew off under boost.
If so, I would say a vacuum leak or your idle screw is not closed enough. 1.2 K idle is too high. Mine would do the 1 -1.5K bounce then settle around 1.2K after adjusting the idle screw as far as it would go to compensate for a very rich idle (too much fuel pressure from manual FPR). It would also bounce like that if the PCV hose blew off under boost.
Thread Starter
Senior Member
Joined: Dec 2002
Posts: 126
From: Mystic, CT
Originally Posted by TYSON' date='Jun 4 2003, 05:16 AM
Revs up and down like you are blipping the throttle?
If so, I would say a vacuum leak or your idle screw is not closed enough. 1.2 K idle is too high. Mine would do the 1 -1.5K bounce then settle around 1.2K after adjusting the idle screw as far as it would go to compensate for a very rich idle (too much fuel pressure from manual FPR). It would also bounce like that if the PCV hose blew off under boost.
If so, I would say a vacuum leak or your idle screw is not closed enough. 1.2 K idle is too high. Mine would do the 1 -1.5K bounce then settle around 1.2K after adjusting the idle screw as far as it would go to compensate for a very rich idle (too much fuel pressure from manual FPR). It would also bounce like that if the PCV hose blew off under boost.
Senior Member
Joined: Jan 2003
Posts: 2,871
From: London, Ontario
Originally Posted by rbrtech' date='Jun 4 2003, 09:20 AM
[quote name='TYSON' date='Jun 4 2003, 05:16 AM'] Revs up and down like you are blipping the throttle?
If so, I would say a vacuum leak or your idle screw is not closed enough. 1.2 K idle is too high. Mine would do the 1 -1.5K bounce then settle around 1.2K after adjusting the idle screw as far as it would go to compensate for a very rich idle (too much fuel pressure from manual FPR). It would also bounce like that if the PCV hose blew off under boost.
If so, I would say a vacuum leak or your idle screw is not closed enough. 1.2 K idle is too high. Mine would do the 1 -1.5K bounce then settle around 1.2K after adjusting the idle screw as far as it would go to compensate for a very rich idle (too much fuel pressure from manual FPR). It would also bounce like that if the PCV hose blew off under boost.
It would take a massive vacuum leak to bleed off that much pressure. You may need to do the whole vacuum hose job. Your problem may be a combination of vacuum leak and solenoid trouble?
Senior Member
Joined: Jan 2003
Posts: 2,871
From: London, Ontario
Originally Posted by 94boosted' date='Jun 4 2003, 09:08 PM
[quote name='TYSON' date='Jun 4 2003, 05:16 AM'] Revs up and down like you are blipping the throttle?
If so, I would say a vacuum leak or your idle screw is not closed enough. 1.2 K idle is too high. Mine would do the 1 -1.5K bounce then settle around 1.2K after adjusting the idle screw as far as it would go to compensate for a very rich idle (too much fuel pressure from manual FPR). It would also bounce like that if the PCV hose blew off under boost.
If so, I would say a vacuum leak or your idle screw is not closed enough. 1.2 K idle is too high. Mine would do the 1 -1.5K bounce then settle around 1.2K after adjusting the idle screw as far as it would go to compensate for a very rich idle (too much fuel pressure from manual FPR). It would also bounce like that if the PCV hose blew off under boost.
Well, as long as you are ABSOLUTELY sure you have no vacuum leaks, you can adjust the idle screw. Check for leaks first. You can hear if the PCV valve blew off 6 feet away!
The idle screw is on the underside of the throttle body. You can adjust your idle from 1.2K down to 800. CHECK FOR LEAKS FIRST!!
