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Author
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Topic: No Acceleration?! 92 5.0L
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Wildfire532FB
CAFords OG
Member # 1482
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posted
 
 
Symptoms: No aceleration, idles lower than normal, low vaccuum, no codes, no vacuum leaks, if you lightly give it gas the vehicle jerks and bangs the transmission, intermitten problem will only do it for a couple of seconds, acts like its missing while driving, Idle sounds really funny but if i let it sit for 2 minutes the idle smoothes out and goes back to normal RPM and normal Vacuum levels.
I have no idea what the problem is, i replaced the EGR, EGR sensor and wiring for the EGR(connector was broken) None of that did anything. I don't get any codes from the computer except the system pass code. Has anyone had this problem before? what did you change to fix it?
I BELIEVE the fuel filter was replaced maybe 2 years ago but i don't remember if i did change it or not. Spark plugs and wires were replaced maybe 10,000 miles ago, I'm just going by memory here i don't have all my written down information infront of me.
It runs fine when the engine is cold but does it while the engine is near running temp. Sometimes though when i start it and the engine is cold instead of keeping the rpms up in the beginning it just goes straight to idle. Sometimes doesn't idle good cold either.
Modifications: E303, Hooker headers, K&N, intake gap, MSD ignition, engine is in a highly modified CJ7 Jeep.
thanks in advance for your suggestions or comments,
Dana
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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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Blind
2.3L
CAFords OG
Member # 3052
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posted
catelytic converters are plugged, have you recently been hearing rattling from the exhaust that went away? A chunk of the cat's honeycomb might have broken apart and spun sideways blocking the exhaust flow.
my truck behaved the exact same way, computer scans (ODB-II) showed misfires while under acceleration, nothing else.
I took the Y pipe off and sure enough, peices of the cat fell out when I pulled it off the truck ![[Frown]](frown.gif)
oh well, a fireplace poker and a sledge hammer took out the rest of the honeycomb and get it back on the road and running better than ever ![[Razz]](tongue.gif)
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89 LX Notchback ex 4cyl, 14psi
02 Harley F150, 15psi
Posts: 8521 | From: Fairfield | Registered: Jul 2003
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Wildfire532FB
CAFords OG
Member # 1482
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posted
I haven't heard any funny noise from the exhuast. Is there any way i can test that though?
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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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Blind
2.3L
CAFords OG
Member # 3052
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posted
any competent muffler shop should be able to flow test the cats.
one quick way to test though is take it off and drive it open headers to see if it runs any different ![[Smile]](smile.gif)
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89 LX Notchback ex 4cyl, 14psi
02 Harley F150, 15psi
Posts: 8521 | From: Fairfield | Registered: Jul 2003
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Wildfire532FB
CAFords OG
Member # 1482
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posted
A couple of nights ago it was doing the no acceleration thing and i floored it and heard a pop nosie from the passenger side of the engine. Then all of a sudden it basicly lost all power i didn't think i'd make it home but i did, it would only cruise at around 25 mph and thats with me giving it a lot of gas.
Yesterday i had my dad drive it cause i really thought something broke and it would do it for him and of course it didn't so i drove it to school and the gym and it never did it! I THINK coming home right when i got to the bottom of my hill i think it did it for a second but i am not sure. I have no idea what this is and its driving me nuts! I am going to drive it today and see if it does it.
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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
i drove it yesterday to my morning work and i think it did it when i turned on my electrical fan, once i turned it off it stopped ![[Confused]](confused.gif)
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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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Rickster
¯
Member # 962
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posted
Could be be bad O2 sensors?
When you get to Grass Valley look me up...
273 7021
[ February 17, 2005, 01:04 PM: Message edited by: Rickster ]
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1965 ACCobra Replica (FFR MKll)
w/ 1992 LX convert. running gear
Planning ahead for that midlife crissis!
Posts: 131 | From: Cedar Ridge | Registered: Mar 2002
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Blue Oval
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Member # 2548
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posted
just curious what kind of condition is the timing chain in?stock?or replaced when cam was swaped?THAT COULD be the problem but its not very likely.
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65 Coupe 306, AFR's
89 Cali. Ed. Saleen "sold"
BAB 89 GT
08 Yamaha R6
Posts: 2345 | From: Sacramento | Registered: Mar 2003
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BlueOvalRacing
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Member # 1531
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posted
just for kicks, borrow someone's MAF and see if it gets better
Posts: 1159 | From: Pioneer | Registered: Jul 2002
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Wildfire532FB
CAFords OG
Member # 1482
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posted
quote:
Originally posted by Blue Oval:
just curious what kind of condition is the timing chain in?stock?or replaced when cam was swaped?THAT COULD be the problem but its not very likely.
i replaced it when i did the cam swap.
i experimented today on my lunch break i let it Idle with the fan on and it was running really crappy, sounded like it was missing hella badly, so i turend the fan off and it immediately started idling good. So i turned the fan on again and it immediately went back to crappy. I think the alternator can't handle the load the electric fan puts on it, even though its been in this set up for months and i never had this problem before. i have a 160 amp alternator in the garage that i need to get fixed so i am going to do that tomorrow and put it back on the Jeep and see what that does.
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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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Fostang
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Member # 3752
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posted
Could it be fan wash on the maf?
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67' Fastback TT 408
67' Camaro Lsx
64' Corvette Fuelie
57' Chevy Bel Air Lsx
68’ Pony Convertible
66’ Pony Coupe
Posts: 3013 | From: Stockton/Danville | Registered: Nov 2003
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Wildfire532FB
CAFords OG
Member # 1482
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posted
quote:
Originally posted by Fostang:
Could it be fan wash on the maf?
i would think it would be the opposite if it was. When the fan is off the engine runs good, when the fan is on it runs crappy as hell.
[ February 17, 2005, 11:59 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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Fostang
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Member # 3752
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posted
no because when the fan is on it shoots colder air into the open element screwing with the maf that measures the temperatur of the incoming air.
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67' Fastback TT 408
67' Camaro Lsx
64' Corvette Fuelie
57' Chevy Bel Air Lsx
68’ Pony Convertible
66’ Pony Coupe
Posts: 3013 | From: Stockton/Danville | Registered: Nov 2003
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Wildfire532FB
CAFords OG
Member # 1482
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posted
so wouldn't it still run better if that happened?
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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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Fostang
¯
Member # 3752
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posted
How well does it drive with the fan off?
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67' Fastback TT 408
67' Camaro Lsx
64' Corvette Fuelie
57' Chevy Bel Air Lsx
68’ Pony Convertible
66’ Pony Coupe
Posts: 3013 | From: Stockton/Danville | Registered: Nov 2003
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Wildfire532FB
CAFords OG
Member # 1482
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posted
its drives like normal, might have a slight miss but i am not completely sure.
When idling with the fan on though it idles 300rpms lower and the vacuum is about 3lbs lower. When i turn the fan off everything goes back to normal range. The pop noise i heard a couple of days ago i wonder what that was cause ever since then it has driven really good nots of acceleration but when i turn the fan on it gets iffy and i don't think the fan made any difference a week ago.
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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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Wildfire532FB
CAFords OG
Member # 1482
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posted
i wonder if that alternator was what made that pop noise ![[Eek!]](eek.gif)
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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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Fostang
¯
Member # 3752
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posted
one of those things you have to be there to diagnose.
That popping noise could have been a cat clearing out that was damaged?
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67' Fastback TT 408
67' Camaro Lsx
64' Corvette Fuelie
57' Chevy Bel Air Lsx
68’ Pony Convertible
66’ Pony Coupe
Posts: 3013 | From: Stockton/Danville | Registered: Nov 2003
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Wildfire532FB
CAFords OG
Member # 1482
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posted
no the popping noise came from the front of the Jeep on the passenger side so now i am positive it was the alternator that made the noise. I originally thought it could have been the air pump or some vacuum line on that side.
[ February 18, 2005, 12:19 AM: Message edited by: Cobra5.0JEEP ]
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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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