© Copyright 1995 thru 2008 - The Mustang Works™. All Rights Reserved.
MustangWorks.com is designed and hosted by Aero3 Media.
MustangWorks.com is designed and hosted by Aero3 Media.
04-04-2003, 12:15 AM | #1 |
Registered Member
Join Date: Jan 2003
Location: Palm Bay, FL
Posts: 432
|
Hard to start/high initial rpms
I've had a sh*tload of work done on the car...things like the IAC valve, coolant temp, and throttle position sensors were replaced...and it's got BRAND NEW 19 lb/hr fuel injectors. It's running a very steady 13 degrees of timing on 93 octane gas. It's got decent wires, new plugs, a new cap and rotor, and a new Blaster TFI coil.
This problem has been here all along, since before and after the repairs, and I've had people tell me this isn't normal behavior. The car is a little hard to start all the time, even after it's been thoroughly warmed up. It'll crank and crank or a good 2 seconds each time. Sometimes I can let my finger off the key before it actually 'starts' and it'll start itself. That's the first problem. Second is, when it starts, the rpms fly up to around 2000, and slowly fall down to around 1000, until I tap the gas or let it warm thoroughly or give it another minute or so, in which case it falls to a normal idle of around 700-750. It throws no check engine lights, and runs great besides this! What could be going on...it seems to me like it's getting extra fuel. Could the fuel pressure regulator be the cause? I want to check my fuel pressure with a gauge via the Schrader valve, but none of my friends have one and they cost like $45....I'm broke. Thanks guys!
__________________
'91 Mustang GT 5.0 AOD Daily Driver Current stats: NEW 302 short block, E-303 cam (@.050, 220/220, .498/.498, 110 degrees), 1.6 roller rockers, Performer RPM heads (aluminum, 1.9/1.6, 60cc chambers), Cobra intake, Granatelli 75mm MAF, Billet AFPR, Equal-Length Shorty Headers, Off-Road X Pipe, Flowmasters, 4.10 POSI 13.73 at 103.8, ~2.2 60' |
04-05-2003, 01:12 AM | #2 |
Registered Member
Join Date: Feb 2002
Location: Nebraska
Posts: 86
|
Fuel pump. There is not too much fuel, there is not enough. Change the fuel filter, if that doesn't help you might want to change the pump. But you need to get a reading on the fuel pressure when you first turn the key to the "on" (primes the system) position before starting the motor. It should without delay shoot up to at least 38psi immediately. If not you may have cloged filter or weak pump.
__________________
Proud RHC member #99 1990 Mustang GT Trick Flow heads,F303,Mac cold air,FMS 65mm tb,73mm ma,FMS 1.6,GT-40 intake,MSD igintion,NOS Big Shot@150,Mac equal shorties,Mac h-pipe,American Thunder flows,Centerforce dual friction,TTC 3550,alm drive shaft, 3.73's, HPM subframes, k-member brace, strut tower brace.. amongst others. |
04-05-2003, 07:29 AM | #3 |
Registered Member
Join Date: Jan 2003
Location: Palm Bay, FL
Posts: 432
|
Maybe my neighbor Chad will have one... My only obstacle to this is getting the damn fuel pressure tester. They dont have these available for rental at DAP/Autozone do they?
__________________
'91 Mustang GT 5.0 AOD Daily Driver Current stats: NEW 302 short block, E-303 cam (@.050, 220/220, .498/.498, 110 degrees), 1.6 roller rockers, Performer RPM heads (aluminum, 1.9/1.6, 60cc chambers), Cobra intake, Granatelli 75mm MAF, Billet AFPR, Equal-Length Shorty Headers, Off-Road X Pipe, Flowmasters, 4.10 POSI 13.73 at 103.8, ~2.2 60' |
04-05-2003, 05:58 PM | #4 |
Registered Member
Join Date: Aug 2001
Location: Woodlawn IL,USA
Posts: 62
|
I agree it could be fuel filter/pump but you might want to check all of your vaccum lines and make sure the upper and lower intake gaskets are sealed(spry carb cleaner around the intake and vac line areas.) If you have a line that has a hair line crack in it, it may not idle high when the car warms up or you pop the throttle to (surge) the vac pressure. The same goes for the upper and lower; if the gaskets are sealing up when the car warms up it will quit.......just some more ideas but DO GET THE GAUGE AND CHECK THE FUEL PRESS.!!!
|
04-06-2003, 03:25 AM | #5 |
Registered Member
Join Date: Jan 2003
Location: Palm Bay, FL
Posts: 432
|
The Schrader valve is on the passenger side of the engine, on a stainless steel line going vertically right? Looks like a valvestem for a tire?
__________________
'91 Mustang GT 5.0 AOD Daily Driver Current stats: NEW 302 short block, E-303 cam (@.050, 220/220, .498/.498, 110 degrees), 1.6 roller rockers, Performer RPM heads (aluminum, 1.9/1.6, 60cc chambers), Cobra intake, Granatelli 75mm MAF, Billet AFPR, Equal-Length Shorty Headers, Off-Road X Pipe, Flowmasters, 4.10 POSI 13.73 at 103.8, ~2.2 60' |
04-06-2003, 03:40 PM | #6 |
Registered Member
Join Date: Aug 2001
Location: Woodlawn IL,USA
Posts: 62
|
Yes that is the correct valve; Those fuel pressure gauges are at autozone for 'round 35 bucks if you can swing it.
|
04-06-2003, 07:51 PM | #7 |
Registered Member
Join Date: Jan 2003
Location: Palm Bay, FL
Posts: 432
|
I found them at Autozone, but it was $45...and right now I have $5, 1/2 tank of gas, and I quit my job last night. It's on the top of my 'tools to buy when I get a new job' list though, along with compression and vacuum gauges! And a timing light. I kinda stole my buddy's and he forgot...I guess I should buy my own and give it back huh??
__________________
'91 Mustang GT 5.0 AOD Daily Driver Current stats: NEW 302 short block, E-303 cam (@.050, 220/220, .498/.498, 110 degrees), 1.6 roller rockers, Performer RPM heads (aluminum, 1.9/1.6, 60cc chambers), Cobra intake, Granatelli 75mm MAF, Billet AFPR, Equal-Length Shorty Headers, Off-Road X Pipe, Flowmasters, 4.10 POSI 13.73 at 103.8, ~2.2 60' |
04-07-2003, 05:45 PM | #8 |
Registered Member
Join Date: Aug 2001
Location: Woodlawn IL,USA
Posts: 62
|
I guess things are more expensive in FL!!
Good luck on the job hunting.... Later, Brad |
04-07-2003, 09:42 PM | #9 |
Registered Member
Join Date: Jan 2003
Location: Palm Bay, FL
Posts: 432
|
Thanks man..hopefully Mario over at Discount Auto Parts wasn't lying when he said they're looking for someone to do part time, 25-30 hours a week, and over 18. That's me in a nutshell.
__________________
'91 Mustang GT 5.0 AOD Daily Driver Current stats: NEW 302 short block, E-303 cam (@.050, 220/220, .498/.498, 110 degrees), 1.6 roller rockers, Performer RPM heads (aluminum, 1.9/1.6, 60cc chambers), Cobra intake, Granatelli 75mm MAF, Billet AFPR, Equal-Length Shorty Headers, Off-Road X Pipe, Flowmasters, 4.10 POSI 13.73 at 103.8, ~2.2 60' |
|
|
Similar Threads | ||||
Thread | Thread Starter | Forum | Replies | Last Post |
Problems with RPM's | cgg074 | Modular Madness | 2 | 09-29-2003 10:12 PM |
Motor breaking up past 3000 rpms. Gurus I need your help!!! | Miguel | Windsor Power | 0 | 08-13-2002 08:08 AM |
initial startup problem, and now it falls flat on its face | fiveohpatrol | Windsor Power | 2 | 08-09-2002 01:24 AM |
Replacing convertible top. How hard is it? | Dark_5.0 | Windsor Power | 7 | 06-09-2001 09:01 PM |
Help!!1Nasty Driveline vibrations above 2800 rpms | goduke | Windsor Power | 2 | 01-29-2001 12:54 AM |