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-   -   Car starts easier when cold when foot is pressed all the way down on gas pedal (https://www.rx7club.com/2nd-gen-general-discussion-323/car-starts-easier-when-cold-when-foot-pressed-all-way-down-gas-pedal-1124322/)

David731 03-14-18 02:47 PM
Car starts easier when cold when foot is pressed all the way down on gas pedal
 
cranked way quicker and fired right up when I started it with my foot to the floor on the gas pedal. 30 degree weather. Any ideas?

dillrx7 03-14-18 06:32 PM
cold start? modded? stock ecu? need details lol, 100% throttle usuall cuts injectors as a flood clear not sure if factory ecu does it

David731 03-14-18 07:13 PM
Originally Posted by dillrx7 (Post 12260429)
cold start? modded? stock ecu? need details lol, 100% throttle usuall cuts injectors as a flood clear not sure if factory ecu does it
Stock ECU. Cranked it a few times it would not start, pressed my foot all the way down on the gas and cranked, started right up.

lduley 03-15-18 06:54 AM
Originally Posted by dillrx7 (Post 12260429)
cold start? modded? stock ecu? need details lol, 100% throttle usuall cuts injectors as a flood clear not sure if factory ecu does it
it does on s5, not s4

David731 03-15-18 07:52 AM
Originally Posted by lduley (Post 12260519)
it does on s5, not s4
Yes it’s an S5 and it only happened on a cold start, once I was moving it around it would start right up without pressing the pedal all the way down

smikels 03-15-18 07:58 AM
My thoughts are fuel pump might be after market creating more fuel pressure then needed would be my guess. Options to fix are.

1. Just feather the throttle or press it down to start like you did.
2. Get a Fuel Pressure Regulator so it can set the fuel pressure to normal.
3. Buy an after market ECU that can adjust fuel at cranking.


I have an 1988 turbo II which is an S4. I had a fuel cut swtich for the longest time that worked great, but mainly needed it for the hot starts. Now I have a aftermarket ECU and that takes care of it.

David731 03-15-18 10:06 AM
Originally Posted by smikels (Post 12260529)
My thoughts are fuel pump might be after market creating more fuel pressure then needed would be my guess. Options to fix are.

1. Just feather the throttle or press it down to start like you did.
2. Get a Fuel Pressure Regulator so it can set the fuel pressure to normal.
3. Buy an after market ECU that can adjust fuel at cranking.


I have an 1988 turbo II which is an S4. I had a fuel cut swtich for the longest time that worked great, but mainly needed it for the hot starts. Now I have a aftermarket ECU and that takes care of it.
That actually makes more sense, because back when I first got it wasn’t wanting to start up, (vacuum leaks) and when I pumped the throttle a bit it would sound like it wanted to catch more

David731 03-20-18 10:34 PM
Update. Vacuum leaks fixed, car is idiling great now, like it should. Still having the same problem where it sometimes starts with my foot all the way to the floor and sometimes with me not touching the throttle at all. Usually ill crank it without touching the pedal and hear it kinda catch but not start so I’ll stop cranking wait a few seconds and put my foot to the floor on the gas pedal and crank, and boom starts right up.

David731 03-21-18 11:56 AM
Bump. Any ideas?

lduley 03-21-18 07:34 PM
I'd get the injectors serviced if they never have

David731 03-21-18 10:24 PM
Originally Posted by lduley (Post 12262271)
I'd get the injectors serviced if they never have
I’m starting to think it’s the starter. I’m gonna get it tested it, after all it was sitting in the trunk when I bought the car lol

David731 03-22-18 09:17 PM
Originally Posted by lduley (Post 12262271)
I'd get the injectors serviced if they never have
will not having an 02 sensor affect the idle?

Rotary Alkymist 03-23-18 01:49 AM
Originally Posted by David731 (Post 12262561)

will not having an 02 sensor affect the idle?
Yes.

David731 03-23-18 08:05 AM
Originally Posted by Rotary Alkymist (Post 12262614)
Yes.
Okay, putting one in since the car doesn’t have one. I also know that the throttle linkage is a bit messed up. (Need New TB soon) we tightened the cable as much as we could and the idle was perfect. But then after letting it sit for a day, and coming back and letting it run, the idle went back to hunting between 750-1000 rpm


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