Bad Lag Help plz

50runner · June 22nd, 2008, 04:48 PM

My 94 GT has been running really bad lately once i start it up it will run good and strong for about 10 min. then the rest of the day it sucks. I will step into the gas and it seems like the motor is holding back. When it runs strong my car pulls really hard in 2nd at 4k but when it lags it will not go anywhere but it seems to run better when i get the accelerator about 25% down.

I have changed the Spark Plugs and wires, Fuel Filter, and MAF Sensor but it still seems to act up. Any ideas??

Arctic Fox · June 23rd, 2008, 04:46 AM

Coolant temperature sender?

humbleLX · June 23rd, 2008, 07:19 AM

what is ur TPS set to? r u throwing any codes for ignition or fuel components?

punkid · June 23rd, 2008, 01:38 PM

+ 1 ("Coolant temperature sender?")
for the computer not the gauge

50runner · July 1st, 2008, 11:11 PM

i dont know what my tps is set to and i am going to run the codes tommorow but i dont think its the coolant temperature sender cause it seems to be more of a fuel or electrical problem

e3sean · July 1st, 2008, 11:12 PM

blown head gasket?

Hunt_chevs · July 2nd, 2008, 05:24 PM

Originally Posted by e3sean

blown head gasket?

ouch

Hunt_chevs · July 2nd, 2008, 05:24 PM

thats tough

Sleeper_Stang_89 · July 3rd, 2008, 03:42 AM

tru dat

e3sean · July 3rd, 2008, 04:14 AM

it would make sence once it warms up and the water pressureizes and seeps into the cylender it will jack up the air fuel ratio and u would loose power..

Darrell · July 3rd, 2008, 06:36 AM

Test the coolant temp sensor. A simple google search will tell you what the specifications should be. You might be able to find the specs on Autozone or Advanced Auto Parts websites. If that checks out, pressure test the cooling system with the car warm.

Racinjason81 · July 3rd, 2008, 10:48 AM

how about clogged cats

JasonMarshall · July 3rd, 2008, 02:04 PM

I had the same issue on my 91, Cleaned the Idle control and its now MUCH better.

dr.gonzo · July 3rd, 2008, 02:19 PM

That should only effect the idle, and the idle would be better when warm with a bad iac

His car is fuggin up when warm.

78mach1 · July 3rd, 2008, 03:54 PM

+1 on darrel and sean, you can do both of those test very quick and easy

JasonMarshall · July 3rd, 2008, 08:15 PM

Originally Posted by dr.gonzo

That should only effect the idle, and the idle would be better when warm with a bad iac

His car is fuggin up when warm.

This is exactly how mine was acting as well..... All the symptoms of a blown head gasket without the compression loss or oil/antifreeze mix.

Darrell · July 4th, 2008, 04:31 AM

Originally Posted by Racinjason81

how about clogged cats

Definitely a possibility as well but I'd check the easy things like the coolant temp sensor and a cooling system pressure test first.

June 22nd, 2008, 04:48 PM	#1
50runner Newbie 1994 Mustang GT TBA Join Date: Jun 2008 Location: MD Posts: 2	Bad Lag Help plz My 94 GT has been running really bad lately once i start it up it will run good and strong for about 10 min. then the rest of the day it sucks. I will step into the gas and it seems like the motor is holding back. When it runs strong my car pulls really hard in 2nd at 4k but when it lags it will not go anywhere but it seems to run better when i get the accelerator about 25% down. I have changed the Spark Plugs and wires, Fuel Filter, and MAF Sensor but it still seems to act up. Any ideas??

June 23rd, 2008, 07:19 AM	#3
humbleLX Regular 1989 LX hatch Join Date: Apr 2008 Location: Honolulu, Hawaii Posts: 54	what is ur TPS set to? r u throwing any codes for ignition or fuel components? __________________ GT40 crate Ecam 1.7RR GT40X alum head GT40 P1SC 12rib IC 12 psi 42inj AFM PMS IV PMAS 3" Flotube BBK 70mm TB 255 Walbro short hdr BBK o/r X, 2ch Flows, way too much to list... if it ain't blown, it sucks... Black & Tan

July 1st, 2008, 11:12 PM	#6
e3sean MM Fanatic 1988 lx 5.7 11.6@109 Join Date: Nov 2007 Location: arizona Posts: 3,575	blown head gasket? __________________ the only thing u will be burning by going with a 347 insted of a 331 is the guy driving the 331 MILITARY CREW USAF LUKE AFB AZ, E-5 SELECT 7995 AMMO I.Y.A.A.Y.A.S

July 3rd, 2008, 03:42 AM	#9
Sleeper_Stang_89 Regular 1989 Mustang Gt Run me and find out!!! Join Date: Jun 2008 Location: Lake City, FL Posts: 441	tru dat __________________ 331 ways to WASTE an LS1...

July 3rd, 2008, 04:14 AM	#10
e3sean MM Fanatic 1988 lx 5.7 11.6@109 Join Date: Nov 2007 Location: arizona Posts: 3,575	it would make sence once it warms up and the water pressureizes and seeps into the cylender it will jack up the air fuel ratio and u would loose power.. __________________ the only thing u will be burning by going with a 347 insted of a 331 is the guy driving the 331 MILITARY CREW USAF LUKE AFB AZ, E-5 SELECT 7995 AMMO I.Y.A.A.Y.A.S

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June 23rd, 2008, 04:46 AM	#2
Arctic Fox Regular 1989 GT KB 2.1L Flowzilla Join Date: Mar 2008 Location: Old World Posts: 269	Coolant temperature sender?

June 23rd, 2008, 01:38 PM	#4
punkid Newbie 1989 lx convertable 11.30 Join Date: Jan 2008 Posts: 19	+ 1 ("Coolant temperature sender?") for the computer not the gauge

July 1st, 2008, 11:11 PM	#5
50runner Newbie 1994 Mustang GT TBA Join Date: Jun 2008 Location: MD Posts: 2	i dont know what my tps is set to and i am going to run the codes tommorow but i dont think its the coolant temperature sender cause it seems to be more of a fuel or electrical problem

July 2nd, 2008, 05:24 PM	#8
Hunt_chevs Hardcore Enthusiast 88 Gt Not Slow Join Date: Aug 2007 Location: SJ-CA, 50-ft elev. Posts: 1,580	thats tough

July 3rd, 2008, 06:36 AM	#11
Darrell Asshole™ 1990 Mustang LX 9.36@143 mph Join Date: Jan 2006 Location: Fond du Lac, Wisconsin Posts: 7,762	Test the coolant temp sensor. A simple google search will tell you what the specifications should be. You might be able to find the specs on Autozone or Advanced Auto Parts websites. If that checks out, pressure test the cooling system with the car warm. __________________ Racing in memory of Dave Bandt 11/19/69 - 3/23/08 "he's traded his wheels for wings" Professor of Natural Aspiration Thanks to: Artie at Trick Flow, Dave at Team Z Motorsports, Brian at Total Engine Airflow and Harold at Furo Racecraft

July 3rd, 2008, 10:48 AM	#12
Racinjason81 Hardcore Enthusiast Join Date: Feb 2007 Location: New jersey Posts: 1,400	how about clogged cats __________________ Speed kills drive an import and live forever. 1991 LX 5.0 H/B(T-70 turbo coming soon) 1990 T-BIRD SC(daily driver)

July 3rd, 2008, 02:04 PM	#13
JasonMarshall Newbie 2002 V6/1967 Mustang Join Date: Apr 2008 Location: Denison, Texas Posts: 36	I had the same issue on my 91, Cleaned the Idle control and its now MUCH better. __________________ 2002 V6 Mustang/ 5 Spd, cold air, flowmaster exhaust, Hedman Headers 1991 LX 5.0 Convertible, Flowmaster 40's 1991 LX 5.0 Hatch, offroad h pipe, Flowmaster 40's 3.77's with a locker

July 3rd, 2008, 02:19 PM	#14
dr.gonzo Enthusiast Join Date: Oct 2006 Location: kc mo Posts: 840	That should only effect the idle, and the idle would be better when warm with a bad iac His car is fuggin up when warm. __________________ FREE LUNCH, FINAL WISDOM, TOTAL COVERAGE... WHY NOT?

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