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06-23-09, 04:30 PM
|  | Member | | Join Date: August 2004 Location: upstate ny
Posts: 39
| |  HELP LETS SEE WHO KNOWS THE 97 COBRA
MY 97 COBRA OUT OF THE BLUE STARTED BREAKING UP AT 5800 RPMS.WHAT WOULD CAUSE THIS I HAVE CHECKED MOST OF THE THINGS .CHANGED ALL KIND OF SENSORS COILS PLEASE HELP |
06-23-09, 04:44 PM
|  | Official Member | | Join Date: December 2008
Posts: 158
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> check your fuel psi and make sure it's not dropping out in the high rpm's>
if thats not it them check you crank> sensor > sometimes a electrical problem is the worst think to deal with > ( If it's a electrical problem ) take your time and go over everything twice > a couple of buddys and a case of beer helps>  sometimes more heads more ideas good luck ! |
06-23-09, 05:47 PM
| | Member | | Join Date: August 2004 Location: upstate ny
Posts: 39
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any body else please help fuel pressures good changed the crank sensor no luck |
06-23-09, 09:29 PM
| | Member | | Join Date: August 2004 Location: upstate ny
Posts: 39
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somebody has to have idea |
06-24-09, 06:32 AM
| | Member | | Join Date: August 2004 Location: upstate ny
Posts: 39
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06-24-09, 01:16 PM
| | Member | | Join Date: August 2004 Location: upstate ny
Posts: 39
| | | help!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
someone, anyone, suggestions |
06-24-09, 11:43 PM
| | Official Member | | Join Date: December 2008
Posts: 158
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??? sell it to me cheap > that would solve it > did you try looking at the plug wires in the dark to see if there cracked and grounding out under load? what about your cam sensor on the driver side head? |
06-25-09, 05:56 PM
|  | pardon my stupidity | | Join Date: June 2007 Location: 4th level of hell, Texas
Posts: 1,094
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Your gap on the plugs is too great or your fuel filter is cloged. |
06-25-09, 11:18 PM
|  | Premier Member | | Join Date: July 2007 Location: poteet,tx
Posts: 838
| | | miss
could be all the above,,not to forget bad valves,,
sell it to jeremy...he wants to go faster |
06-26-09, 02:33 AM
|  | SuperMod
it doe snot | | Join Date: January 1999 Location: the people's republic of massachusetts
Posts: 12,018
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Did you check fuel pressure AT WOT at idle does you no good..
after that I would check the crank pulley balancer and see if it's coming apart or if the trigger wheel is damaged. |
06-29-09, 10:21 PM
| | Member | | Join Date: August 2004 Location: upstate ny
Posts: 39
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motor got rebuilt last year problem still there also running lean bank 2 .havent found anybody with help this sucks |
06-30-09, 04:46 AM
| | Official Member | | Join Date: December 2008
Posts: 158
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mine has a check engine light too for a lean condition on bank two > I was going to change the o2 and see if that fixed it > I haven't checked the intake gasket yet> I still drive it everyday. |
06-30-09, 09:08 AM
| | Member | | Join Date: August 2004 Location: upstate ny
Posts: 39
| | Quote:
Originally Posted by jeremy canter  mine has a check engine light too for a lean condition on bank two > I was going to change the o2 and see if that fixed it > I haven't checked the intake gasket yet> I still drive it everyday. | swap them to other side more than likley its not o2 at least my car didnt change ive checked everything that could be possible. |
06-30-09, 09:14 AM
| | Member | | Join Date: August 2004 Location: upstate ny
Posts: 39
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does anyone know how to check for intake leak?besides spraying carb cleaner around tried that nothing happened.also wouldnt you notice a leak by watching my boost gauge got great vacuum at idle 22lbs no fluctuations.any more ideas would be appreciated car still breaks up at 5800 rpms unless i gap my plugs down but that doesnt explain whats really wrong because when i installed the blower all was great for 6 moths then started to break up at 5800  |
06-30-09, 01:22 PM
| | Member | | Join Date: August 2004 Location: upstate ny
Posts: 39
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[QUOTE=stang88j;7949107]does anyone know how to check for intake leak?besides spraying carb cleaner around tried that nothing happened.also wouldnt you notice a leak by watching my boost gauge got great vacuum at idle 22lbs no fluctuations.any more ideas would be appreciated car still breaks up at 5800 rpms unless i gap my plugs down but that doesnt explain whats really wrong because when i installed the blower all was great for 6 moths then started to break up at 5800 [/QUOTE ANYONE ELSE |
06-30-09, 09:00 PM
| | Member | | Join Date: August 2004 Location: upstate ny
Posts: 39
| | | help
[QUOTE=stang88j;7949364] Quote:
Originally Posted by stang88j does anyone know how to check for intake leak?besides spraying carb cleaner around tried that nothing happened.also wouldnt you notice a leak by watching my boost gauge got great vacuum at idle 22lbs no fluctuations.any more ideas would be appreciated car still breaks up at 5800 rpms unless i gap my plugs down but that doesnt explain whats really wrong because when i installed the blower all was great for 6 moths then started to break up at 5800 [/QUOTE ANYONE ELSE | hello |
06-30-09, 11:09 PM
|  | Official Member | | Join Date: May 2003
Posts: 94
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Stock injectors? Changed your fuel filter? Cleaned the IAC?
How old are the coil packs? When did you last change wires?
When did you last have it tuned? |
07-01-09, 07:16 AM
| | Member | | Join Date: August 2004 Location: upstate ny
Posts: 39
| | Quote:
Originally Posted by mustang_jr+ Stock injectors? Changed your fuel filter? Cleaned the IAC?
How old are the coil packs? When did you last change wires?
When did you last have it tuned? | new injectors last summer, new coil packs ,new fuel filter. wires were done last summer same with tune sept tune done on dyno |
07-01-09, 01:35 PM
| | Founding Member | | Join Date: March 2000 Location: tampa,fl
Posts: 312
| | Quote:
Originally Posted by stang88j new injectors last summer, new coil packs ,new fuel filter. wires were done last summer same with tune sept tune done on dyno | There's your problem. If they aren't OEM or Screamin Demon chances are they can't keep up. MSD are notorious for failing at high rpms.
-Mark |
07-01-09, 04:29 PM
| | Official Member | | Join Date: May 2003
Posts: 94
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msd are worse than stock coils. Get rid of them. |
07-01-09, 10:25 PM
| | Official Member | | Join Date: June 2003 Location: cleveland, oh
Posts: 477
| | Quote:
Originally Posted by mustang_jr+ msd are worse than stock coils. Get rid of them. | good to know. on the push rod motors I like their products. |
07-02-09, 11:07 AM
| | Member | | Join Date: August 2004 Location: upstate ny
Posts: 39
| | Quote:
Originally Posted by mustang_jr+ msd are worse than stock coils. Get rid of them. | screaming demon coils. The problem started with the msd coils but the stocks didnt do anything then i changed to screaming deamons still same problem untill i gap plugs down but origanally the msds and stock coils allowed the car to open up to rev limiter out of the blue the car wouldnt rev past 5800 rpms |
07-02-09, 11:13 AM
| | Member | | Join Date: August 2004 Location: upstate ny
Posts: 39
| | Quote:
Originally Posted by bitemark46 There's your problem. If they aren't OEM or Screamin Demon chances are they can't keep up. MSD are notorious for failing at high rpms.
-Mark | i tried everything but my tuner said it was running out of fuel and pulling timing at 5800 but didnt know why so i replaced fuel pump to 255 walboro pump didnt seem to help fuel pressure looks good vacuum looks good what gives |
07-05-09, 10:05 AM
| | Official Member | | Join Date: May 2003
Posts: 94
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Check the vacuum line, make sure it's not over stretched or tired at the connections.
hose is cheap, is it the original one? I replaced mine a while back, it had dried out. |
07-05-09, 01:17 PM
| | Member | | Join Date: August 2004 Location: upstate ny
Posts: 39
| | Quote:
Originally Posted by mustang_jr+ Check the vacuum line, make sure it's not over stretched or tired at the connections.
hose is cheap, is it the original one? I replaced mine a while back, it had dried out. | vacuum from tank? | | Thread Tools | | | | Display Modes |  Linear Mode | 
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1997 Ford cobra
the snake
