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#21 | |
![]() ![]() Join Date: Nov 2007
Location: Squires (near Ava MO in the Mark Twain N'tl Forest) - Missouri
Posts: 6,493
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For what its worth, when the secondary pump was not working, FP dropped to 38# at WOT, and the AFR went very lean!
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Good carz, good food, good friendz = the best of timez! 90 #1202 "FBI" top end ported & relieved Cam timing by "Pete the Greek" Sans secondaries Chip & dyno tuning by Haibeck Automotive SW headers, X-pipe, MF muffs Former Secretary, ZR-1 Net Registry |
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#22 | |
![]() Join Date: Jan 2009
Location: Portland Oregon metro area (Washington side)
Posts: 3,207
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However, if you get one failing like mine mid 40s is not good enough. Mine Now starts with 52lb and stays there until sustained WOT then drops to about 49lb then shoots back to 52lb when the secondary pump kicks in. At this point I think he needs to rule out the basic stuff before looking at secondary actuators. It's hard enough chasing one's tail but if your chasing the wrong tail? She better be worth it ![]() By what he's describing the secondary fuel pump could very well be seized up. Best rule that out.
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Scott ![]() Vett owner since 1979._It's about the car and the people |
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#23 |
![]() Join Date: Jul 2009
Location: Washington Township NJ
Posts: 49
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If one or two of the secondary injector were not firing, wouldn't that act as more a miss. I would think the other 6 would pull it along. This feels like either no fuel or no air mixuture. The primeries are driving the engine. I know I called it a stumble but really its just a no power feel. right up to 7,000 rpm's.
I can feel another plemun pull is in my future. At which time the vacuum system is history. |
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#24 |
![]() Join Date: Mar 2004
Location: Found Member
Posts: 4,346
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It's a 4 1/2 hour drive for me to Westminster from the southeast shore on L.I.
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Frank Urbo. NCM Lifetime member # 982 Registry Founding # 237 |
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#25 |
![]() Join Date: Jul 2009
Location: Washington Township NJ
Posts: 49
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Ok, so I will tape my fuel gauge to my windshield tonight. It would be an easy fix if the pump is the problem. Seems I should have some kind of error code for this problem.
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#26 | |
![]() Join Date: Jul 2005
Location: Las Vegas, Nevada
Posts: 777
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You say that you do not have any codes? The DIC will show SES light if the secondaries do not open, so it probably is not your secondary vac sys. So this narrows it down to fuel or ignition. Is it blowing smoke when it starts to bumble and gurgle? Have you checked your plugs to see if they are wet? Color? When the VSS (Vehicle Speed Sensor) goes bad, it limits the rpms to 3k and does some weird things from what I know. It also may or may not throw a code 24. It could also be an intermittant code 24. It will affect other things also like the Ride Control;Radio; or Speedometer. Anyhow, this is just an idea to check. Forgot to ask does it do this when the power key is turned off? If so, it probably is not the VSS.
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JB 1990 #148 Red/Saddle Haibeck AYBKG5 Chip/RC Engineering/Flowmasters/K&N/Samco/Fuzzy Dice :cheers: Last edited by John Boothby; 06-13-2012 at 02:30 PM. |
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#27 |
![]() Join Date: Jul 2009
Location: Washington Township NJ
Posts: 49
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With valet mode car runs fine rev's up to 7,00 with no problems. There are no codes. I have not seen any smoke out back but than again I'm in car alone. Will take wife with me tonight. Will pull plugs after ride and report findings. Yesterday my radio antenna was very squerrilly wouldn't go up , than worked, than wouldn't, than would. The car goes over 3,000 just doesn't run right.
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#28 |
![]() ![]() Join Date: Jun 2005
Location: pittsburgh
Posts: 4,633
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i didn't think you could wind the car to 7,000 without the key on
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It's not the car, it's the people - Doug Johnson 90 r/r "KEYS ON" nick named "T.L.B" |
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#29 | |
![]() Join Date: Jul 2005
Location: Las Vegas, Nevada
Posts: 777
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If it is running ok in "Normal" mode, it probably is not the VSS. I am leaning toward secondary fuel problem.
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JB 1990 #148 Red/Saddle Haibeck AYBKG5 Chip/RC Engineering/Flowmasters/K&N/Samco/Fuzzy Dice :cheers: Last edited by John Boothby; 06-13-2012 at 03:44 PM. |
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#30 |
![]() Join Date: Jan 2009
Location: Portland Oregon metro area (Washington side)
Posts: 3,207
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I believe it does go on up to 7k but with less vigor
![]() About the VSS probability of failure..... Another test for it is cruise control. It will not work. The only thing that bothers me about all this is that the stumbling starts at 3k. Seems like it should set a lean code if held at the 3k point.
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Scott ![]() Vett owner since 1979._It's about the car and the people |
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