bucking & skipping

stang4to8 · 10-14-2002, 03:09 PM

have 88 x4cyl stang conv. to 89efi with mass air. have prob with skipping & bucking during driving, usually part throttle.this is what ive done. rem & cl. upper intake, t.b. , egr spacer, mass air sensor, 10 pin conn. on eng, i.a.c. on intake, 190lph fuel pump, msd6a, tfi blaster coil, plugs--autolights gap .54, taylor wirers, cap & rotor & conical kn with shielding from fan wash,pcv seals around gromet good & rattles ok. eng hadbeen in afriends roll-over.all parts used 4 conv. from the same 89gt. my car is 5 speed, computer is auto. also replaced all gaskets{except 4 heads}adj tps to .98 & reset comp. idle strategy--used to surge bad. the eng, computer and eng harness were apart for almost three years. car interm. runs well & idle & sounds great. please help with bucking issue.

LX XLR8R · 10-14-2002, 03:21 PM

could be too high fuel pressure or the speed soensor from the tranny..how your plugs look?

stang4to8 · 10-14-2002, 03:44 PM

plugs looked decent, first set autolites, 2nd set bosch platnums- car bucked worse with these 3rd set autolites installed today. only thing in in fuel syst changed was pump, stock regulator. would the speed sensor really cause a interm. bucking prob.

LX XLR8R · 10-15-2002, 09:52 AM

as far as PRO-M says..yes...they said in my MAF conversion instructions that if the speed sensor wire wasn't connected then you could experiance some part throttle bucking as you are

stang4to8 · 10-15-2002, 10:51 AM

well my setup is stock 89 electronics [everything]. my speedometer dosnt work & never has, trans prob with internal gear not turning speedo gear. might this be a problem?

LX XLR8R · 10-15-2002, 01:12 PM

yes it might!

stang4to8 · 10-16-2002, 05:52 AM

double & tripple checked 4 vac. leaks, none. decided 4 the hell of it to rem egr valve last night & it was so nasty. it bas this thick black cruddy build up in it & i mean alot! cleaned it out good & cleaned & used tri-flo lub. on the shaft that the valve moves back & forth on. will reinstall later today. prob. wont make any diff but will try anything at this point. would bad o2 sensors or maf sensor cause car to buck & skip at part throttle?

LX XLR8R · 10-16-2002, 09:17 AM

yes either could also but why start replaceing stuff that is probally not broken when you have infact a problem that is known to couse your conditon?

stang4to8 · 10-16-2002, 10:25 AM

well i grt mixed opinions about the vss. if that is the prob i have to get my trans fixed first. i know its not the cable or the gear at the end of it ot the guage cluster becuase ive replaced them all. well its probl a good idea anyway to repl the o2 sensors, 98k. my bud has a 93 5.0lx droptop.should it be ok to try his maf?

10-14-2002, 03:09 PM	#1
stang4to8 Registered Member Join Date: Aug 2002 Location: new hampshire Posts: 48	bucking & skipping have 88 x4cyl stang conv. to 89efi with mass air. have prob with skipping & bucking during driving, usually part throttle.this is what ive done. rem & cl. upper intake, t.b. , egr spacer, mass air sensor, 10 pin conn. on eng, i.a.c. on intake, 190lph fuel pump, msd6a, tfi blaster coil, plugs--autolights gap .54, taylor wirers, cap & rotor & conical kn with shielding from fan wash,pcv seals around gromet good & rattles ok. eng hadbeen in afriends roll-over.all parts used 4 conv. from the same 89gt. my car is 5 speed, computer is auto. also replaced all gaskets{except 4 heads}adj tps to .98 & reset comp. idle strategy--used to surge bad. the eng, computer and eng harness were apart for almost three years. car interm. runs well & idle & sounds great. please help with bucking issue.

10-14-2002, 03:21 PM	#2
LX XLR8R Dirk Diggler Join Date: Feb 1999 Location: SLOATSBURG, NY Posts: 1,931	could be too high fuel pressure or the speed soensor from the tranny..how your plugs look? __________________ 95 undecided cubes, AFR 185s,undecided cam, undecided intake, and a 150 hit 89 "turbonotch" 2.3T You might want to hold on..i saw this on a cartoon once

10-15-2002, 09:52 AM	#4
LX XLR8R Dirk Diggler Join Date: Feb 1999 Location: SLOATSBURG, NY Posts: 1,931	as far as PRO-M says..yes...they said in my MAF conversion instructions that if the speed sensor wire wasn't connected then you could experiance some part throttle bucking as you are __________________ 95 undecided cubes, AFR 185s,undecided cam, undecided intake, and a 150 hit 89 "turbonotch" 2.3T You might want to hold on..i saw this on a cartoon once

10-15-2002, 10:51 AM	#5
stang4to8 Registered Member Join Date: Aug 2002 Location: new hampshire Posts: 48	bucking prob well my setup is stock 89 electronics [everything]. my speedometer dosnt work & never has, trans prob with internal gear not turning speedo gear. might this be a problem?

10-15-2002, 01:12 PM	#6
LX XLR8R Dirk Diggler Join Date: Feb 1999 Location: SLOATSBURG, NY Posts: 1,931	yes it might! __________________ 95 undecided cubes, AFR 185s,undecided cam, undecided intake, and a 150 hit 89 "turbonotch" 2.3T You might want to hold on..i saw this on a cartoon once

10-14-2002, 03:44 PM	#3
stang4to8 Registered Member Join Date: Aug 2002 Location: new hampshire Posts: 48	plugs looked decent, first set autolites, 2nd set bosch platnums- car bucked worse with these 3rd set autolites installed today. only thing in in fuel syst changed was pump, stock regulator. would the speed sensor really cause a interm. bucking prob.

10-16-2002, 05:52 AM	#7
stang4to8 Registered Member Join Date: Aug 2002 Location: new hampshire Posts: 48	part throttle buck double & tripple checked 4 vac. leaks, none. decided 4 the hell of it to rem egr valve last night & it was so nasty. it bas this thick black cruddy build up in it & i mean alot! cleaned it out good & cleaned & used tri-flo lub. on the shaft that the valve moves back & forth on. will reinstall later today. prob. wont make any diff but will try anything at this point. would bad o2 sensors or maf sensor cause car to buck & skip at part throttle?

10-16-2002, 09:17 AM	#8
LX XLR8R Dirk Diggler Join Date: Feb 1999 Location: SLOATSBURG, NY Posts: 1,931	yes either could also but why start replaceing stuff that is probally not broken when you have infact a problem that is known to couse your conditon? __________________ 95 undecided cubes, AFR 185s,undecided cam, undecided intake, and a 150 hit 89 "turbonotch" 2.3T You might want to hold on..i saw this on a cartoon once

10-16-2002, 10:25 AM	#9
stang4to8 Registered Member Join Date: Aug 2002 Location: new hampshire Posts: 48	bucking well i grt mixed opinions about the vss. if that is the prob i have to get my trans fixed first. i know its not the cable or the gear at the end of it ot the guage cluster becuase ive replaced them all. well its probl a good idea anyway to repl the o2 sensors, 98k. my bud has a 93 5.0lx droptop.should it be ok to try his maf?

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