Hard Starting 92

[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.

[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

[tccrab]

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]

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

[bobbyhi]

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]

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]

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

[Kevin]

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]

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.

[tomtom72]

Originally Posted by Jim Nolan

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.

Me too....I thought I was the only one. I do it because I used to get random Cam Sensor codes if I hit the key over too quickly. Ever since I've taken to going to Key On, and stopping to wait for the lights to go out on the DIC and have the pumps stop and then go to Start I haven't had any Cam Sensor codes. Used to be a real pia.

Sodak52, my apologies for going off topic.
You are aware that there have been random cases where FIC injectors have soft failures right out of the box? In this case it sure sounds like you could have one or two that leak slightly. I'm not throwing rocks at Jon & FIC, but I've noticed in all the FIC threads there are random out of the box soft failures in a few cases. You may want to check the plugs for wetness the next time you start up from stone cold. You know let it crank and not pump the pedal, and if you get a no start in a reasonable time, stop cranking and go check the plugs for gas. Or you can pull the plenum and see if the injectors are leaking while you power up the pumps with the KOEO position.

Or you could hook up a fuel pressure gauge to the rail and then crank but not start it and watch to see if the PSI decays quickly. That symptom could indicate a leaking injector. Also, did you check the F/P regulator for gas in the vac hose?


Tom