Rpms fall if I give a quick blip of the gas

dr.gonzo! · August 5th, 2009, 11:18 PM

Lately when I start up my car the car seems to want to hold high rpm for longer than normal(like on a cold start) and when I start to go from a stop it seems like it hesitates or sputter of a second and then it finally catches up.

Today at the gas station I was giving it a couple quick blips on the gas and instead of revving up the rpms dropped. It also seems like its not as fast as it used to be. I am changing the plugs tomorrow because I haven't done it in a while but if that doesn't help it what do you think it could be?

Timing is at 14 and fuel pressure is at 30 if I recall right.

medic4.life · August 5th, 2009, 11:31 PM

u running carburetor?

Iownastang · August 6th, 2009, 12:07 AM

fuel pressure gives it away that hes injected..

First off i would get a fuel pressure guage and turn the pressure up to atleast 39, then i would keep it on there to see if it was holding constant pressure or fluxuating when you give it gas.

coreyflipp · August 6th, 2009, 01:39 AM

I'd also check for vacuum leaks. My car was running all kinds of shitty when I first got it, wouldn't idle consistently, almost sounded like it had a cam, would hesitate when giving throttle.

It was a dry rotted hose attached to the underside of the upper intake.

dr.gonzo! · August 6th, 2009, 02:17 AM

Here is a crappy video. You cant even really see it but around 8 seconds you will see it drop when I barely touche the gas.

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ddarkslayer · August 6th, 2009, 02:46 AM

I've had the same problem with my car it would surge when the car warms up and throw codes my fuel pressure was running at 10 psi when it should be at 40 then I had to change the fuel pump

ddarkslayer · August 6th, 2009, 02:47 AM

Is the engine bogging

dr.gonzo! · August 6th, 2009, 12:04 PM

I hope I don't have to change the pump its a 255 not even a year old.

ddarkslayer · August 6th, 2009, 05:50 PM

you usually have a warranty for a year what maker is it

dr.gonzo! · August 6th, 2009, 11:47 PM

I fixed it. I had read somewhere that there was more hp at 29 psi, I adjusted it to that not taking the vacuum line into consideration. And then I tried adjusting it without a gauge after it started acting up, finally got a gauge and it was at 50 psi

its back to 39 now and running better.

August 6th, 2009, 01:39 AM	#4
coreyflipp Regular 1990 Mustang gt Join Date: Jul 2007 Location: college station, texas Posts: 471 iTrader: 0 reviews	I'd also check for vacuum leaks. My car was running all kinds of shitty when I first got it, wouldn't idle consistently, almost sounded like it had a cam, would hesitate when giving throttle. It was a dry rotted hose attached to the underside of the upper intake. __________________ 2002 gt 5-speed 1990 gt 5-speed 1981 Notch Roller

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August 5th, 2009, 11:31 PM	#2
medic4.life Newbie Join Date: Jul 2009 Posts: 25 iTrader: 0 reviews	u running carburetor?

August 6th, 2009, 02:46 AM	#6
ddarkslayer Hardcore Enthusiast 1988 Mustang 5.0 LX 12.48@118.27 Join Date: May 2009 Location: Folsom, CA Posts: 1,325 iTrader: 0 reviews	I've had the same problem with my car it would surge when the car warms up and throw codes my fuel pressure was running at 10 psi when it should be at 40 then I had to change the fuel pump

August 6th, 2009, 02:47 AM	#7
ddarkslayer Hardcore Enthusiast 1988 Mustang 5.0 LX 12.48@118.27 Join Date: May 2009 Location: Folsom, CA Posts: 1,325 iTrader: 0 reviews	Is the engine bogging

August 6th, 2009, 05:50 PM	#9
ddarkslayer Hardcore Enthusiast 1988 Mustang 5.0 LX 12.48@118.27 Join Date: May 2009 Location: Folsom, CA Posts: 1,325 iTrader: 0 reviews	you usually have a warranty for a year what maker is it

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