Hard Starting 92 - ZR-1 Net Registry Forums

Sodak52 · 02-01-2010

I put in a new set of injector this fall, along with new coils and spark plug wires. The car starts and runs well , but I have to pump the gas a little to get it to fire. What would cause this? It started great prior to replacing the parts. Any tips would be a great help.

Ccmano · 02-01-2010

When you say "hard starting" I assume you mean you have to let it crank a few seconds be for it fires up?
Question 2, Cold, hot or both?
BTW stepping on the throttle does nothing. Fuel injected engines don't generally react to throttle input during the starting cycle.
H

tccrab · 02-01-2010

Quote:

Originally Posted by Ccmano

When you say "hard starting" I assume you mean you have to let it crank a few seconds be for it fires up?
Question 2, Cold, hot or both?
BTW stepping on the throttle does nothing. Fuel injected engines don't generally react to throttle input during the starting cycle.
H

I agree with Hans on this point. In the good old days of carubreted cars, you'd have to pump the pedal a couple of times to give the engine a little extra fuel for easier start ups.
Fuel injected cars shouldn't need any pedal action to start up normally. The key word here is "normally".
However, if something isn't quite right, then maybe it does.
My WAG (wild azzed guess) would be that a over-rich condition might exhibit this kind of symptom.
Maybe if you had a couple of leaky injectors and two or more cylinders were a tad flooded then a little extra air might be just exactly what the doctor ordered.
Is there more than the usual puff of smoke when you start it up?
What injectors did you put in?

TomC
"Crabs

GOLDCYLON · 02-02-2010

Start with the basics what fuel pressure readings are you getting at the rail? BTW welcome to the forum

bobbyhi · 02-02-2010

Quote:

Originally Posted by Sodak52

I put in a new set of injector this fall, along with new coils and spark plug wires. The car starts and runs well , but I have to pump the gas a little to get it to fire. What would cause this? It started great prior to replacing the parts. Any tips would be a great help.

Didn't know I had another Z right next door to me!! I live in Mendota Heights and willing to come over and help. PM me and we can talk. Welcome to the forum..............

Sodak52 · 02-02-2010

I put in FIC Rebuilt injectors. I know it seems strange that pumping the gas helps in starting but it does. Temperture of the engine doesn't seam to have an effect.

batchman · 02-02-2010

I haven't looked into this yet but on another car this would sound like a dirty idle air path.

Not often you run into "not enough air" but this sure sounds like the case when you would.

Good luck,
- Jeff

Pete · 02-06-2010

Quote:

Originally Posted by Sodak52

I put in FIC Rebuilt injectors. I know it seems strange that pumping the gas helps in starting but it does. Temperture of the engine doesn't seam to have an effect.

Sure sounds like you are a bit rich/leaky injectors.

Pete

Kevin · 02-02-2010

if the car takes a few cranks to turn over that's normal. the way the ignition system is set up it takes a while for the crank sensor to be in the proper position to fire the car

Jim Nolan · 02-03-2010

This may sound too basic but when I start mine I turn on the key and wait until the fuel pump stops pressurizing the fuel rails before I turn to start. It starts up every time with out delay.

02-01-2010	#1
Sodak52 Join Date: Mar 2008 Location: Eagan, MN Posts: 9	Hard Starting 92 I put in a new set of injector this fall, along with new coils and spark plug wires. The car starts and runs well , but I have to pump the gas a little to get it to fire. What would cause this? It started great prior to replacing the parts. Any tips would be a great help. __________________

02-01-2010	#2
Ccmano Join Date: Jun 2006 Location: Sparks, NV Posts: 2,852	Re: Hard Starting 92 When you say "hard starting" I assume you mean you have to let it crank a few seconds be for it fires up? Question 2, Cold, hot or both? BTW stepping on the throttle does nothing. Fuel injected engines don't generally react to throttle input during the starting cycle. H __________________ 90'ZR-1 #1461 Red/Black Ported Intake, Degreed Cams, OBX Headers & Exhaust, Fidanza FW, Secondary Delete, Custom tune, C6 GS Wheels. Sold 08 C6 Z51 Crystal Red Metallic Sold Vararam Intake, Tune, Sold 05 C6 Z51 Red/Black Sold 90'ZR-1 #1723 Black/Gray Sold but not forgotten 91' Z51 L98 White Vert. My First, you always remember your first. Sold.

02-02-2010	#4
GOLDCYLON Join Date: May 2007 Location: Peoria, AZ Posts: 9,155	Re: Hard Starting 92 Start with the basics what fuel pressure readings are you getting at the rail? BTW welcome to the forum __________________ GOLDCYLON - 91 ZR-1 #2014 GOLDCYLON - 90 ZR-1 #2794, 4L60e (Formerly Schrade's) GOLDCYLON - 11 CTS-V Arizona State Director 91 WHITE/BLACK #2014. 380 P&P&PCed,Ported Heads, Jeal Long tubes, Corsa Exhaust/FIKSE FM-5s /LED TLs, LED Headlights, Front Wilwood 6 piston narrowlite calipers and rear Wilwood caliper street shop mod,CNCed Coolant Pipes,TPI Cvr,Filter cover,Stainless Bolts, DRM/DOM PROM /ZFDOC mod build #102,DRLs,BMAD with stainless Debris Screen,Coplan Air Blaster, Pioneer APP Radio 4,Brey-Krause HB,Sub Bar,Fire extinguisher seat mount,DRM Coilovers,LEDs everywhere,Compass mirror (orange),V1 DIC hidden display, Homelink sun visor, Carbon Fiber top x3 and APSIS Carbon Fiber interior, APSIS CF Steering Wheel/NAPA Leather, Banski trailing arms, Guldstrand front suspension,urethane bushings from Prothane (total suspension) ZFDoc drive shaft safety loop, raptor shift light (orange),AO engineering louver front plate, Console seat cushion, 96CE seats with black custom Sheepskins, ss billet catch can,Viper remote entry/alarm,Cragar Rear Louvers,LED side louver lights, Dewitts Radiator with SPAL fans and a Woods 160 T-Stat 90 RED/BLACK #2794. 4L60e Automatic Stage V by RPM Transmission, TCI Dedicated TCM, OBX Stainless Headers, Corsa Exhaust, SAN Secondaries and Haibeck PROM, Exotic Muscle Coil overs, LED Interior Lights, LED Tail Lights, LED Headlights, 94 Sport seats with black custom Sheepskins , Cragar rear louvers, GS Front calipers, Banski Trailing arms, APSIS Carbon Fiber steering wheel, Front and Rear Baer Eradispeeds, DRLs, Guldstrand front suspension,urethane bushings from Prothane (total suspension), Dewitt's Raditor with Dual SPAL fans and a Haibeck 170 T-Stat 11 RED/GREY CTS-V

02-02-2010	#6
Sodak52 Join Date: Mar 2008 Location: Eagan, MN Posts: 9	Re: Hard Starting 92 I put in FIC Rebuilt injectors. I know it seems strange that pumping the gas helps in starting but it does. Temperture of the engine doesn't seam to have an effect. __________________

02-02-2010	#7
batchman Join Date: Jun 2009 Location: I live at Devens, one run at a time Posts: 455	Re: Hard Starting 92 I haven't looked into this yet but on another car this would sound like a dirty idle air path. Not often you run into "not enough air" but this sure sounds like the case when you would. Good luck, - Jeff __________________ [I]91 ZR-1 #1840, autocrossing in SCCA BSP. FIC S/S's DRM chip/Watson/Borla/lid/LW batt&headlights, springs, shocks, pads & lines, quick rack & Turn One, camber brace, 32/22mm sways, A/C halfway deleted 17x11 & 12 CCW's, 315 & 335 Hoosier A6s [/I]

02-02-2010	#9
Kevin Join Date: Jun 2005 Location: pittsburgh Posts: 4,632	Re: Hard Starting 92 if the car takes a few cranks to turn over that's normal. the way the ignition system is set up it takes a while for the crank sensor to be in the proper position to fire the car __________________ It's not the car, it's the people - Doug Johnson 90 r/r "KEYS ON" nick named "T.L.B"

02-03-2010	#10
Jim Nolan Join Date: Jan 2007 Location: Florida Posts: 241	Re: Hard Starting 92 This may sound too basic but when I start mine I turn on the key and wait until the fuel pump stops pressurizing the fuel rails before I turn to start. It starts up every time with out delay.

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