This is topic '97 cobra boggin 5k rpm UPDATE 2/3 *Fixed* in forum Tech Talk at Northern California Ford Owners  .


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Posted by 90GT510 (Member # 9199) on :
 
**Update: Changed spark plugs to copper ones today, runs a lot better but now instead of bogging at 5k it starts bogging at 6k lol**

Like the title says. got a 1997 cobra and it runs great and revs fine in neutral.

Under heavy acceleration the car is fine up until about 5k rpm then it seems to fall flat and lose power above 5000 rpms.

I already cleaned the MAF any idea of what else it could be?

[ 2015-02-11, 01:34 PM: Message edited by: 90GT510 ]
 
Posted by 70stang351w (Member # 9948) on :
 
does it still have the irmc valves? could be stuck closed or partial open
 
Posted by 90GT510 (Member # 9199) on :
 
quote:
Originally posted by 70stang351w:
does it still have the irmc valves? could be stuck closed or partial open
Gotta check. It doesn't throw any codes btw
 
Posted by SIC9250 (Member # 8216) on :
 
Stuck IMRC plates,delete them,or clean them...Or a fast way is to just zip tie them open from the butterly that the cable opens up...
 
Posted by 90GT510 (Member # 9199) on :
 
quote:
Originally posted by SIC9250:
Stuck IMRC plates,delete them,or clean them...Or a fast way is to just zip tie them open from the butterly that the cable opens up...
Thanks this is very helpful info. I'll zip tie them tomorow as a diagnosis. If it doesn't take car of the issue looks like I'll have to check spark plugs, wires etc
 
Posted by Autumnstang97 (Member # 6111) on :
 
Sounds like when my IMRC were stuck closed. Zipped tied both sides and problem was solved. You can delete them and plug the rod holes so air doesnt cross between ports.
 
Posted by 90GT510 (Member # 9199) on :
 
quote:
Originally posted by Autumnstang97:
Sounds like when my IMRC were stuck closed. Zipped tied both sides and problem was solved. You can delete them and plug the rod holes so air doesnt cross between ports.
Does it throw a code after u zip tie them?
 
Posted by Autumnstang97 (Member # 6111) on :
 
Not that I recall. You should be good to go.
 
Posted by 70stang351w (Member # 9948) on :
 
Heres a how to clean them i didnt have these on mine was fixed using the epoxy method - sacstangdriver did the mod on the cobra motor

http://forums.corral.net/forums/svt-dohc/1232297-cleaned-my-imrcs-just-thought-id-share-many-pics.html

[ 2015-02-02, 12:06 AM: Message edited by: 70stang351w ]
 
Posted by 90GT510 (Member # 9199) on :
 
its proving to be a bitch reaching back there trying to zip tie them. its too cold now ill go back and try a little later. I felt where the one on the driver side was. it looks near impossible to reach the passenger side one.

Any tips on where to zip tie and the best way to approach this?

[ 2015-02-02, 07:27 AM: Message edited by: 90GT510 ]
 
Posted by SLOW95GTS (Member # 10365) on :
 
you can always seafoam it, maybe it clears it up.
 
Posted by 90GT510 (Member # 9199) on :
 
well I tried and I tried to zip tie that shit today but not luck wasted about 30 mins to an hour total on that shit. its making me just want to pull it apart and clean it.
 
Posted by Sinister Mustang (Member # 13889) on :
 
quote:
Originally posted by 90GT510:
well I tried and I tried to zip tie that shit today but not luck wasted about 30 mins to an hour total on that shit. its making me just want to pull it apart and clean it.
Hey 90GT510,

Sorry this is happening to you, Those IMRC's can be a pain in the butt sometimes. I'd either delete or clean them. Be wary of smog regulations and laws if you decide to delete them though.

- Michael
 
Posted by SacStangDriver (Member # 8304) on :
 
how long has it been since youve done the spark plugs? ive seen these engines fall on their face after 5k from not having a tune up. more than once.
 
Posted by Autumnstang97 (Member # 6111) on :
 
If you need help pulling the intake off and deleting them let me know I can lend a hand if you need. I'm in the city.
 
Posted by 90GT510 (Member # 9199) on :
 
quote:
Originally posted by SacStangDriver:
how long has it been since youve done the spark plugs? ive seen these engines fall on their face after 5k from not having a tune up. more than once.
idk when or what kind of spark plugs it got. I was going to check this after if the zip tying of the IMRC didn't solve the issue.
 
Posted by 90GT510 (Member # 9199) on :
 
quote:
Originally posted by Autumnstang97:
If you need help pulling the intake off and deleting them let me know I can lend a hand if you need. I'm in the city.
Thanks for the offer. Although I think I can tackle this one, shouldn't be too crazy.
 
Posted by Autumnstang97 (Member # 6111) on :
 
No problem.
Just take your time and while you're in there you can clean up surrounding parts to detail up your engine bay (if needed).
 
Posted by 70stang351w (Member # 9948) on :
 
have you tried sea-foaming it??
 
Posted by 90GT510 (Member # 9199) on :
 
quote:
Originally posted by 70stang351w:
have you tried sea-foaming it??
no I have not. will this help at all?

I wouldn't want to piss off my neighbors with seafoam for no reason haha
 
Posted by wheelsonly (Member # 10220) on :
 
do you have cats ?
 
Posted by 90GT510 (Member # 9199) on :
 
quote:
Originally posted by wheelsonly:
do you have cats ?
Yes
 
Posted by 93ReefBlue5.0 (Member # 5780) on :
 
miles on the motor? last time a tune up was done? i'd be doing a fuel filter and plugs to start. gapped them @ .054 right? wires and coils as well. start fresh and see what it does.
 
Posted by 90GT510 (Member # 9199) on :
 
quote:
Originally posted by 93ReefBlue5.0:
miles on the motor? last time a tune up was done? i'd be doing a fuel filter and plugs to start. gapped them @ .054 right? wires and coils as well. start fresh and see what it does.
Yes I just did plugs at .054 auto lite coppers. I think I'll be moving on to fuel filter and coil packs (has accel coil packs) and plugs next.
 
Posted by 90GT510 (Member # 9199) on :
 
quote:
Originally posted by 90GT510:
quote:
Originally posted by 93ReefBlue5.0:
miles on the motor? last time a tune up was done? i'd be doing a fuel filter and plugs to start. gapped them @ .054 right? wires and coils as well. start fresh and see what it does.
Yes I just did plugs at .054 auto lite coppers. I think I'll be moving on to fuel filter and coil packs (has accel coil packs) and wires next.

 
Posted by 90GT510 (Member # 9199) on :
 
Fixed! I changed the coil packs and changed the spark plugs and problem went away. It wasn't imrc related
Thanks cafords! [patriot]
 
Posted by 70stang351w (Member # 9948) on :
 
Thats good
 
Posted by Autumnstang97 (Member # 6111) on :
 
Good to hear
 




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