93 GT - engine power cutting out???

J114 · 03-14-2007, 06:30 PM

Im having a problem with engine power cutting out around 3500 rpm.
When problem occurs, engine speed stays constant around 3500 but will not increase. Engine accelerates normal before this. I have installed new sparkplugs/wires, cap/rotor, ignition module/coil,fuel filter. I have road tested with fuel pressure gauge installed, fuel pressure does not drop when problem occurs (40 psi) Engine is stock - cold air intake,underdrive pulleys, and full exhaust are the only mods. I have also recently installed a new Spec stage 1 clutch. Any ideas or info would be greatly appreciated.

Dark_5.0 · 03-14-2007, 11:34 PM

unplug the mass air sensor and see if it will rev normally.

goodyear1984 · 03-15-2007, 01:02 AM

will it rev up if ur not in gear?

Jeff Chambers · 03-15-2007, 08:03 AM

Try cleaning the MAF element with some electrical parts cleaner (not carb or brake parts cleaner).

J114 · 03-16-2007, 06:32 PM

Yes, the engine will always rev normally. The problem occurs underload, the engine will pull hard up to that rpm range. Then it is like you hit a wall - it just won't pull anymore. If I back off the throttle for a second, and then get back on - it will accelerate above that rpm range. Also if I accelerate very gradually it will operate normal, but if I get on the gas hard as if I were racing is when problem occurs. Thank you for reply's

goodyear1984 · 03-16-2007, 10:32 PM

deff sound like the maf try to clean first

USMC302 · 03-22-2007, 06:49 PM

What's the timing set to?

J114 · 03-23-2007, 06:31 PM

The timing is set to 10 deg, I have verified that the timing marks are accurate. I have also tried advancing timing at 12 and 14 deg - still no change. I haven't taken it out yet this year, I will clean the MAF and try that hopefully this weekend.

USMC302 · 03-27-2007, 10:16 AM

Did you get a chance to clean the MAF this weekend? Also, what kind of plugs did you put in when you put the new ones in? On the timing, I have to ask, did you pull the spout connector out when you set the timing, and remember to put it back in? I've had that happen before.. Also, try pulling any codes, see what comes up.

J114 · 03-27-2007, 10:33 AM

I finally got the car out for a spin. I cleaned the mass air and took for a 20 min. run, so far so good - feels like a different car now. Doesn't look the I will get the car out for awhile now, getting another dump of snow as I write this message.

I installed NGK plugs. I did remember to pull/replace spout when setting timing. I have not checked for any stored fault codes - but I was never getting a check engine light coming on. Thank you for the reply's.

03-14-2007, 06:30 PM	#1
J114 Registered Member Join Date: Aug 2003 Location: Airdrie, Alberta - Canada Posts: 28	93 GT - engine power cutting out??? Im having a problem with engine power cutting out around 3500 rpm. When problem occurs, engine speed stays constant around 3500 but will not increase. Engine accelerates normal before this. I have installed new sparkplugs/wires, cap/rotor, ignition module/coil,fuel filter. I have road tested with fuel pressure gauge installed, fuel pressure does not drop when problem occurs (40 psi) Engine is stock - cold air intake,underdrive pulleys, and full exhaust are the only mods. I have also recently installed a new Spec stage 1 clutch. Any ideas or info would be greatly appreciated.

03-14-2007, 11:34 PM	#2
Dark_5.0 Registered Member Join Date: Apr 2001 Location: Staging lane Posts: 4,337	Re: 93 GT - engine power cutting out??? unplug the mass air sensor and see if it will rev normally. __________________ 92' LX-Big brakes, Lots and lots of suspension, GT40X heads, Ported cobra intake, stock cam, Vortech SC trim. 00' Lightning-Stock 88'CRX-13 second ego killer

03-15-2007, 01:02 AM	#3
goodyear1984 Registered Member Join Date: Dec 2006 Location: new york Posts: 482	Re: 93 GT - engine power cutting out??? will it rev up if ur not in gear? __________________ 347 stroker all forged,arp everything,stud mains w/girdle,7qt pan,full roller, custom cam, aluminum heads swirl valves 5 angle valve job.quick fuel 750,areomotive pump,cobras w/nitto drags,and m/t et drags for the track, ford racing 373 gears,centerforce clutch,tko500,underdrive pulleys,bassani x-pipe,flowmasters ^best et so far 11.6 1.61 60ft coming soon 9sec et's 1992 mustang gt 2001 gmc 1500 4x4 78 century boat 92 skidoo

03-15-2007, 08:03 AM	#4
Jeff Chambers Moderator Join Date: Aug 2000 Location: Milan, OH Posts: 2,699	Re: 93 GT - engine power cutting out??? Try cleaning the MAF element with some electrical parts cleaner (not carb or brake parts cleaner). __________________ Jeff Chambers 1990 Mustang GT 10.032 Seconds / 137.5 MPH 14-time Street Warrior World Record Setter CRT Performance 2001 Tropic Green Mustang GT - 12.181 / 113.2 MPH 2002 Ford F-250 Crew Cab 7.3l Power Stroke - 17.41@77.2 "There's nothing boring about a small block automatic shifting gears at 9400 rpm!"

03-16-2007, 06:32 PM	#5
J114 Registered Member Join Date: Aug 2003 Location: Airdrie, Alberta - Canada Posts: 28	Re: 93 GT - engine power cutting out??? Yes, the engine will always rev normally. The problem occurs underload, the engine will pull hard up to that rpm range. Then it is like you hit a wall - it just won't pull anymore. If I back off the throttle for a second, and then get back on - it will accelerate above that rpm range. Also if I accelerate very gradually it will operate normal, but if I get on the gas hard as if I were racing is when problem occurs. Thank you for reply's

03-16-2007, 10:32 PM	#6
goodyear1984 Registered Member Join Date: Dec 2006 Location: new york Posts: 482	Re: 93 GT - engine power cutting out??? deff sound like the maf try to clean first __________________ 347 stroker all forged,arp everything,stud mains w/girdle,7qt pan,full roller, custom cam, aluminum heads swirl valves 5 angle valve job.quick fuel 750,areomotive pump,cobras w/nitto drags,and m/t et drags for the track, ford racing 373 gears,centerforce clutch,tko500,underdrive pulleys,bassani x-pipe,flowmasters ^best et so far 11.6 1.61 60ft coming soon 9sec et's 1992 mustang gt 2001 gmc 1500 4x4 78 century boat 92 skidoo

03-22-2007, 06:49 PM	#7
USMC302 Registered Member Join Date: Apr 2001 Location: Gallatin, Tn Posts: 1,326	Re: 93 GT - engine power cutting out??? What's the timing set to? __________________

03-23-2007, 06:31 PM	#8
J114 Registered Member Join Date: Aug 2003 Location: Airdrie, Alberta - Canada Posts: 28	Re: 93 GT - engine power cutting out??? The timing is set to 10 deg, I have verified that the timing marks are accurate. I have also tried advancing timing at 12 and 14 deg - still no change. I haven't taken it out yet this year, I will clean the MAF and try that hopefully this weekend.

03-27-2007, 10:16 AM	#9
USMC302 Registered Member Join Date: Apr 2001 Location: Gallatin, Tn Posts: 1,326	Re: 93 GT - engine power cutting out??? Did you get a chance to clean the MAF this weekend? Also, what kind of plugs did you put in when you put the new ones in? On the timing, I have to ask, did you pull the spout connector out when you set the timing, and remember to put it back in? I've had that happen before.. Also, try pulling any codes, see what comes up. __________________

03-27-2007, 10:33 AM	#10
J114 Registered Member Join Date: Aug 2003 Location: Airdrie, Alberta - Canada Posts: 28	Re: 93 GT - engine power cutting out??? I finally got the car out for a spin. I cleaned the mass air and took for a 20 min. run, so far so good - feels like a different car now. Doesn't look the I will get the car out for awhile now, getting another dump of snow as I write this message. I installed NGK plugs. I did remember to pull/replace spout when setting timing. I have not checked for any stored fault codes - but I was never getting a check engine light coming on. Thank you for the reply's.

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