vacumleak?

02-09-2001, 08:19 AM

When I start my engine...The rpm is around 2000-2500rpm. First when its hot the rpm goes down under 1000hp. I hate this...must be some kind of vacumleak??? Where should I start looking?

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-87 GT, K&N, 5-speed, Walker exhaust, no air silencer. timing
75000miles. This vinter 3,55 and mac 15/8 and H-pipes
14,61 and 95,59mph

Green92LX · 02-09-2001, 08:31 AM

Could you explain yourself a little better....do you mean that it runs at 2500 until it warms up, then it goes under 1000 once off of cold start?

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1992 5.0 LX, Edelbrock 6037 Heads, Cobra Intake,E-303, 1.6 Roller Rockers,65MM Holley TB, 75 MM Pro M Mass Air, 190 LPH FP w/ 24 lb injectors,BBK equal length shorties,offroad h-pipe,Mac Flowpath Mufflers, Pro 5.0, 3.73's,Motorsport "C" springs,welded subframe connectors, Ponies w/ 225/50 Nittos, 93 Cobra Spoiler

Daily driver: 89 Coupe with 205K plus, BBK shorties,offroad h-pipe,2-chamber flowmasters with dumps, cut and welded stock shifter...and it runs like a champ.

02-10-2001, 08:53 AM

When I start my engine it goes up to 2000-3000rpm..and stay there. When I come to a stoplight and have no gear in the rpm is still 2-3´rpm. But when the engine is really warm it goes down to under 1000rpm. This must be some kind of vacuumleak or???

79Stang · 02-10-2001, 09:44 AM

No vac leak man, most all 5.0 EFI's do this.. It is like a choke for a EFI, it raises the RPM's when the motor is cold and then it idles down...

02-09-2001, 08:19 AM	#1
joakim Guest Posts: n/a	vacumleak? When I start my engine...The rpm is around 2000-2500rpm. First when its hot the rpm goes down under 1000hp. I hate this...must be some kind of vacumleak??? Where should I start looking? ------------------ -87 GT, K&N, 5-speed, Walker exhaust, no air silencer. timing 75000miles. This vinter 3,55 and mac 15/8 and H-pipes 14,61 and 95,59mph

02-09-2001, 08:31 AM	#2
Green92LX Registered Member Join Date: Jun 1999 Location: North Haven,CT Posts: 336	Could you explain yourself a little better....do you mean that it runs at 2500 until it warms up, then it goes under 1000 once off of cold start? ------------------ 1992 5.0 LX, Edelbrock 6037 Heads, Cobra Intake,E-303, 1.6 Roller Rockers,65MM Holley TB, 75 MM Pro M Mass Air, 190 LPH FP w/ 24 lb injectors,BBK equal length shorties,offroad h-pipe,Mac Flowpath Mufflers, Pro 5.0, 3.73's,Motorsport "C" springs,welded subframe connectors, Ponies w/ 225/50 Nittos, 93 Cobra Spoiler Daily driver: 89 Coupe with 205K plus, BBK shorties,offroad h-pipe,2-chamber flowmasters with dumps, cut and welded stock shifter...and it runs like a champ.

02-10-2001, 08:53 AM	#3
joakim Guest Posts: n/a	When I start my engine it goes up to 2000-3000rpm..and stay there. When I come to a stoplight and have no gear in the rpm is still 2-3´rpm. But when the engine is really warm it goes down to under 1000rpm. This must be some kind of vacuumleak or???

02-10-2001, 09:44 AM	#4
79Stang The Stang Gang Join Date: Jan 1999 Location: St. Petersburg Posts: 63	No vac leak man, most all 5.0 EFI's do this.. It is like a choke for a EFI, it raises the RPM's when the motor is cold and then it idles down...