Subject	Perhaps it's an air leak problem. When you give the car
Posted by	doug8867 on May 01, 2012 at 3:09 PM
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In Reply To	Stumble at low rpm, kinda stumped...continued posted by Woody75 (Denver) on May 01, 2012 at 11:13 AM
Message	gas, i.e. increasing rpms the additional fuel makes the air/fuel mixture correct and that's why the car evens out. Could be as simple as one of the large intake or intercooler hoses (if turbo) not being fully seated on the underside of it's connecting pipe. Or loose/cracked recirculation valve hoses. Could use mechanics mirror to check and also that all hose clamps are tight. The only reason I suggest an air issue could be possible is that one time after a plenum pull I did not get the gasket seated properly and unbeknownst to me had a fairly large leak. After buttoning everything back up, the car had a hard time starting and then bogged down quickly, eventually stalling if the accelerator wasn't pressed. However, if I gave it gas to about 2k rpms the car would run and sound normal. I pulled my hair out for a while trying to figure out what the problem was, before I broke down and re-pulled the plenum. There I discovered the gasket had gotten moved/torn and wasn't in the proper location. Put a new one on and the problem was gone. Air regulator might be something else to check too. Lastly, pinched/worn injector o-ring(s)? Of course no way to determine this without pulling plenum and inspecting. :-(
Follow Ups	Stumble at low rpm, kinda stumped...continued - Woody75 (Denver) 11:13:44 05/01/12 I would check connectivity between - njz 12:49:43 05/01/12 It's a 1994. - Woody75 (Denver) 12:59:37 05/01/12 Re: It's a 1994. - njz 13:32:43 05/01/12 Heres what I meant - Woody75 (Denver) 14:06:22 05/01/12 understood. Good luck. (n/m) - njz 14:12:02 05/01/12 When you do a power balance test.... - MeatMan - 604Z.ca - 00:35:34 05/02/12 Probably a crazy idea, but you might check that the - not4resaleZ 12:53:42 05/01/12 They are correct. (n/m) - Woody75 (Denver) 12:57:50 05/01/12 how about the injector connectors? (n/m) - aliaZ 07:47:26 05/02/12 Yep, everything is correct. (n/m) - Woody75 (Denver) 12:31:10 05/02/12 Perhaps it's an air leak problem. When you give the car - doug8867 15:09:52 05/01/12 Already did a boost leak test. - Woody75 (Denver) 15:59:01 05/01/12 Did you check the VTC. - xpwarrior 16:22:03 05/01/12 Ahhh.... Thank you. - OverZealous (CT) 19:28:12 05/01/12 Checked. No issue or change. (n/m) - Woody75 (Denver) 22:06:19 05/01/12 Check the MAF. - MixManMash 19:44:03 05/01/12 MAF has been replaced. (n/m) - Woody75 (Denver) 22:06:48 05/01/12 Maybe it's bad fuel. Dump some STP gas treatment in it. - DVDBURN (MD) 21:11:13 05/01/12 Hes had this issue ever since he got the car. - Woody75 (Denver) 22:05:41 05/01/12 Well guys at this point we may never actually know. - Woody75 (Denver) 22:10:11 05/01/12 Random thought... - JonnyZ(SoCal) 03:58:28 05/02/12 Already been covered. (n/m) - Woody75 (Denver) 07:39:28 05/02/12 Unbalanced TB? (n/m) - nismo_boost31 13:01:37 05/02/12 Re: Stumble at low rpm, kinda stumped...continued - bbsalexaz 16:34:50 05/03/12 Yes, everything was tried one thing at time. (n/m) - Woody75 (Denver) 22:51:15 05/03/12
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