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Author
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Topic: really bad missfire at idle.
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phat50
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Member # 1998
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posted
 
 
my car is missing really bad dont know what it is.i did a full tune up and it still has a miss.sometimes the car idles fine when its cold even when its hot.at idle my motor shakes alot and my vacume guage gose from 18 down to 16 when it starts to miss,but when its not missing vacume is at 18.my friend lowerd my timing from 13 to 10 stock and he said my timing was jumping.fuel presure is good but the needle shakes when its missing.car runs good at full throttle but sometimes it hesitates.could it be a bad distributor? ![[Confused]](confused.gif)
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Posts: 2860 | From: Richmond / Valley jo/ Petaluma | Registered: Oct 2002
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Wildfire532FB
CAFords OG
Member # 1482
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posted
What kind of car do you have? If its a 5.0 i know whats wrong.
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68 Fastback
84 CJ7
94 HMMWV
95 GT
03 F350
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Posts: 17580 | From: 530 | Registered: Jun 2002
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phat50
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Member # 1998
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posted
its a 5.0 90 coupe.
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Posts: 2860 | From: Richmond / Valley jo/ Petaluma | Registered: Oct 2002
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Wildfire532FB
CAFords OG
Member # 1482
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posted
clean your 10 pins those two salt and pepper shakers behind the upper intake, thats how i fixed my car. Get some denatured(sp?) alcohol and some q-tips and clean out each one of the connections and then put some silcon in there and connect it back up.
[ June 05, 2003, 08:21 PM: Message edited by: Cobra5.0Jeep ]
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68 Fastback
84 CJ7
94 HMMWV
95 GT
03 F350
17 Fusion Hybrid
Posts: 17580 | From: 530 | Registered: Jun 2002
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phat50
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Member # 1998
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posted
those black and white plugs behind the intake can cause this problem?i will clean the pins and see what happens,what could it be if it dosint work?
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Posts: 2860 | From: Richmond / Valley jo/ Petaluma | Registered: Oct 2002
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phat50
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Member # 1998
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posted
those are the plugs for the wireing on the top of the motor right?
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Posts: 2860 | From: Richmond / Valley jo/ Petaluma | Registered: Oct 2002
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Wildfire532FB
CAFords OG
Member # 1482
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posted
well it fixed my weird idle.
If that doesn't fix it then i don't know what it could be. Maybe more people will have some insight for you besides just me.
What my idle would do is it would start up nice and then after about 1 or 2 minutes the vacuum would drop from 15 to 8 and it would run like it was missing hella badly. Sometimes it would hesitate but when driving it, it would act normal until i woould come to a stop and then it would act like its missing again
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./_ _ _ ___ __\
(]]]_ _ o _ _[[[)
|\_o_ __ __o_/|
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68 Fastback
84 CJ7
94 HMMWV
95 GT
03 F350
17 Fusion Hybrid
Posts: 17580 | From: 530 | Registered: Jun 2002
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Wildfire532FB
CAFords OG
Member # 1482
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posted
oh also what i did was reset the idle
i unhooked the battery and the idle bypass valve (i think thats what its called) its the skinny thing on the side of your throttle area in the front of it. i connected the battery back up after 10 minutes but not the valve and then started the car it'll run really crappy but adjust your idle while its running like that and then turn off the car and reconnect the valve.
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./_ _ _ ___ __\
(]]]_ _ o _ _[[[)
|\_o_ __ __o_/|
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68 Fastback
84 CJ7
94 HMMWV
95 GT
03 F350
17 Fusion Hybrid
Posts: 17580 | From: 530 | Registered: Jun 2002
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Wildfire532FB
CAFords OG
Member # 1482
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posted
quote:
Originally posted by phat50:
those are the plugs for the wireing on the top of the motor right?
yes the white and black connectors
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./_ _ _ ___ __\
(]]]_ _ o _ _[[[)
|\_o_ __ __o_/|
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68 Fastback
84 CJ7
94 HMMWV
95 GT
03 F350
17 Fusion Hybrid
Posts: 17580 | From: 530 | Registered: Jun 2002
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phat50
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Member # 1998
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posted
well i will clean them and see what happens,thanks alot cobra 5.0 jeep for the info,if it dosent work i appreciat the help anyway. ![[Wink]](wink.gif)
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New toy coming soon!
Posts: 2860 | From: Richmond / Valley jo/ Petaluma | Registered: Oct 2002
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Wildfire532FB
CAFords OG
Member # 1482
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posted
your welcome i hope it works. I spent over 500 dollars replacing parts before someone told me about those two things.
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./_ _ _ ___ __\
(]]]_ _ o _ _[[[)
|\_o_ __ __o_/|
|__|..........|__|
68 Fastback
84 CJ7
94 HMMWV
95 GT
03 F350
17 Fusion Hybrid
Posts: 17580 | From: 530 | Registered: Jun 2002
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phat50
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Member # 1998
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posted
ill reset the idle and let you know what happens.thanks
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New toy coming soon!
Posts: 2860 | From: Richmond / Valley jo/ Petaluma | Registered: Oct 2002
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SLOpony
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Member # 2298
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posted
Just my 2 cents. Sometimes a worn distributor shaft will cause the timing to jump around...the timing jumping will affect idle as well as cause the vaccum to fluctuate.
Posts: 32 | From: Fairfield | Registered: Jan 2003
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Primer GR40
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Member # 476
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posted
or a bad gear on the cam
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Superdupercharged Cobra
No Transmatic Notch
Posts: 2108 | Registered: Sep 2001
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phat50
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Member # 1998
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posted
is there a way to check the distributor shaft to see if its bad or do i just change it?
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New toy coming soon!
Posts: 2860 | From: Richmond / Valley jo/ Petaluma | Registered: Oct 2002
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Fast472Mach1
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Member # 2559
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posted
it should have no side play
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11.7@116 1.7 60ft. N/A
11.4@124 1.9 60ft. 100NX
Posts: 639 | From: Laguna West | Registered: Mar 2003
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phat50
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Member # 1998
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posted
no side play as in the end of the shaft moving from side to side?
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New toy coming soon!
Posts: 2860 | From: Richmond / Valley jo/ Petaluma | Registered: Oct 2002
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phat50
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Member # 1998
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posted
im not sure how to check it?
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New toy coming soon!
Posts: 2860 | From: Richmond / Valley jo/ Petaluma | Registered: Oct 2002
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phat50
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Member # 1998
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posted
PLEASE HELP!!!!!
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New toy coming soon!
Posts: 2860 | From: Richmond / Valley jo/ Petaluma | Registered: Oct 2002
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Wildfire532FB
CAFords OG
Member # 1482
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posted
you get it fixed?
--------------------
./_ _ _ ___ __\
(]]]_ _ o _ _[[[)
|\_o_ __ __o_/|
|__|..........|__|
68 Fastback
84 CJ7
94 HMMWV
95 GT
03 F350
17 Fusion Hybrid
Posts: 17580 | From: 530 | Registered: Jun 2002
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phat50
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Member # 1998
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posted
still have not fix this peace of shit.nothing i try works.would a code scanner work if my check engine light is not on?
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New toy coming soon!
Posts: 2860 | From: Richmond / Valley jo/ Petaluma | Registered: Oct 2002
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66 AC COBRA
Nitrous King
Member # 904
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posted
it would help
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FFR AC Cobra
72 Vega - WCHRA Extreme 10.5
Posts: 6280 | From: Winters | Registered: Feb 2002
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street_illegal_stang
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Member # 1554
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posted
Hey, I know this post is like 4 years old, but i'm curious about what did PHAT50 do to correct the intermediate miss and vacuum fuculation during idle any cruise as I am expireancing the same problems with my 5.0 and I've replaced just about everything including a new distrubutor. ![[BS flag]](graemlins/bs_flag.gif)
So ,Phat50 what happened???or does anyone on here know?
[ September 28, 2007, 09:27 PM: Message edited by: street_illegal_stang ]
Posts: 1276 | From: Long Beach C.A | Registered: Jul 2002
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badazlx
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Member # 4899
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posted
same here. my car runs crappy and is hard to start but when it runs it misses but if i disconnect the maf it goes away, i replaced the maf and did not help.
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03 mach bolt ons/125 shot
Posts: 911 | From: roseville | Registered: Sep 2004
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