jerking pony?

jpumpkinn · 06-19-2002, 06:48 PM

I have been having a problem with my 90 5.0 jerking or surging when I try to cruise between 1300 to 2000 rpm. My question is, " am I driving with the rpms to low or is there something wrong with my car? It seems to be ok when I drive with the rpms close to 2000. I am thinking about taking it to the shop for repairs. Am I having a problem or am I just driving with my rpm's to low? Any information you could give me would help.

Thanks

Coupe5oh · 06-20-2002, 01:53 AM

Yea i would say you need to be in higher rpms, i think anything under 2k in gear will make my car kinda buck a little, is your clutch in good shape? i dunno anything else.

tireburner163 · 06-20-2002, 02:49 AM

sounds like your bogging the motor

PKRWUD · 06-20-2002, 03:50 AM

I would unplug the TPS, attach a DMM with a bargraph, set to ohms, and rotate it slowly while watching the bargraph. If it get's jumpy at all, you have found a worn spot or two in the rheostat, which is causing the signal to the ECM to vary when it shouldn't, causing a jerking motion.

Or it could be you bogging the engine, but I'd check the TPS the way I described.

Take care,
-Chris

ChunkFunky · 06-20-2002, 06:32 AM

I'm assuming he's got a standard, cause I have an AOD and I feel it surge at certain RPMs too... I'd check into the TPS thing, I assumed it was something like that.. though it doesnt bother me enough.. I'm usulay all or nothing on the gas anyway...

cyberstang5.0 · 06-20-2002, 06:35 AM

I run my pony between 1300 and 2000 at cruise speed. I never have any problems with it bogging down or hesitating. It just a little less responce under 2k. I try to keep it about 2k just incase I need to romp on it for whatever reason

. You are driving in the proper RPM range. Check your computer and see if your thoughing any codes.

89 Cobra LX · 06-20-2002, 07:44 AM

I had a problem like that at one point and a reset the TPS. Problem solved.

RPM427 · 06-20-2002, 07:45 AM

My friend has a B-cam in his car and it has a dead spot at 1500, if he tries to keep it there, it just starts bucking.

06-19-2002, 06:48 PM	#1
jpumpkinn Registered Member Join Date: Jun 2001 Location: san antonio Texas usa Posts: 127	jerking pony? I have been having a problem with my 90 5.0 jerking or surging when I try to cruise between 1300 to 2000 rpm. My question is, " am I driving with the rpms to low or is there something wrong with my car? It seems to be ok when I drive with the rpms close to 2000. I am thinking about taking it to the shop for repairs. Am I having a problem or am I just driving with my rpm's to low? Any information you could give me would help. Thanks __________________ Keep On Truckin!!

06-20-2002, 01:53 AM	#2
Coupe5oh Registered Member Join Date: Nov 2001 Location: SanAntonio, Tx Posts: 734	Yea i would say you need to be in higher rpms, i think anything under 2k in gear will make my car kinda buck a little, is your clutch in good shape? i dunno anything else. __________________ Police package 5spd 90 Lx, Stock original motor, 3.27grs, BM fan, fms 10.5 clutch, D&D quadrant, and adjuster, ADS chip, 180 stat, mac cai, mac h-pipe, mac subframe connectors, ASP crank pulley, ripper shifter, 26x10.5 M/T sport pros welds. 246 hp according to analyzer Race weight: 3,120 E.t-13.57 with 26x10.50's e.t. streets. 1.88 60' mph- 99.92 mph

06-20-2002, 02:49 AM	#3
tireburner163 It's a lot like a race car Join Date: Aug 2000 Location: Meridian, MS Posts: 4,130	sounds like your bogging the motor __________________ 1987 Buick T-type 1998 HD Electra Elide

06-20-2002, 03:50 AM	#4
PKRWUD Junior Member Join Date: Mar 1999 Location: Ventura, California Posts: 8,981	I would unplug the TPS, attach a DMM with a bargraph, set to ohms, and rotate it slowly while watching the bargraph. If it get's jumpy at all, you have found a worn spot or two in the rheostat, which is causing the signal to the ECM to vary when it shouldn't, causing a jerking motion. Or it could be you bogging the engine, but I'd check the TPS the way I described. Take care, -Chris __________________ Webmaster: Rice Haters Club Jim Porter Racing Peckerwoods Pit Stop Support Your Local RED & WHITE!

06-20-2002, 06:32 AM	#5
ChunkFunky Registered Member Join Date: Apr 2002 Location: Tustin, CA Posts: 465	I'm assuming he's got a standard, cause I have an AOD and I feel it surge at certain RPMs too... I'd check into the TPS thing, I assumed it was something like that.. though it doesnt bother me enough.. I'm usulay all or nothing on the gas anyway... __________________ '89 GT Convertible: TFS TW Heads, TFS Street Intake, TFS Stage 1 Cam, FMS 1.6 RRs, 24# Injectors, Pro-M 75mm MAF, No Name CAI, 3.73s, O/R H-Pipe, FlowMasters, AOD w/ Trans-Go Shift Kit

06-20-2002, 06:35 AM	#6
cyberstang5.0 347ci of HORSE POWER!!! Join Date: Jul 2001 Location: Houston, TX Posts: 1,416	I run my pony between 1300 and 2000 at cruise speed. I never have any problems with it bogging down or hesitating. It just a little less responce under 2k. I try to keep it about 2k just incase I need to romp on it for whatever reason . You are driving in the proper RPM range. Check your computer and see if your thoughing any codes.

06-20-2002, 07:44 AM	#7
89 Cobra LX Don Corlione Join Date: Jun 2001 Location: Omaha NE USA Posts: 491	What PKRWUD said I had a problem like that at one point and a reset the TPS. Problem solved. __________________ Eric - 89 Mustang LX coupe 5 speed 302-Cobra Intake-GT40p heads-TFS stage 1 cam-FRPP 1.6 roller rockers-3:73 gears-KYB shocks and struts-Eibach Pro-kit-HPM Mega-bite upper and lower control arms-FRPP aluminum driveshaft-16x8 Chrome Cobra Rs R.H.C. #14

06-20-2002, 07:45 AM	#8
RPM427 Registered Member Join Date: Aug 2001 Location: Huntington NY Posts: 573	My friend has a B-cam in his car and it has a dead spot at 1500, if he tries to keep it there, it just starts bucking. __________________ -1993 Mustang, 900rwhp 03-04 cobra based 4v swap, full Griggs setup, project underway -1994 Ranger w/ 427cid windsor (daily beater) check it out!

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