have a problem where when i start my car it struggles to start when it does its at very low rpm i need to hit the gas to get it to idel right after that the car runs and driver normal there is no check engine light

the car was running fine the day before this just came out of the blue i replaced the spark plugs and ignition coils checked fuses i just cant figure out whats wrong any help would be good thanks

 

So are you saying that your car runs well and idles at the right speed after its been driven a while?

Also that you only have this problem when the car has not been driven over night, or hasn't run for several hours?

 

the car was being driven almost every day to work then when this virus came it was just to the store it was fine the day before then when i went to go some where the next day it was like this

but the car does this on cold and hot startup if i dont hit the gas it will ether cut off or get to its normal idle after about 5-10sec after that is ok its like normal

 

Let's talk about how the car starts when the engine is warm.
1. Does it start easily if the car has been parked tor a brief time. Like after 5 minutes or so

2 is it more difficult to start if the engine is still warm, but it's been parked for 1/2 hour or 1 hour?

3. Does the exhaust smell like gasoline after a hard-to-start episode.


Possible causes could be a dirty IACV or a leaking fuel injector. These are common issues which cause the symptoms you are having.

 

it starts the same weather its been parked or driven

same doesn't worm start or cold it acts the same

yea if it takes me a couple of times to get it to start it will smell like gas when it does start

 

You mentioned that it idles at low rpm after it does start. Does it seem like it's running on all cylinders and run smoothly when it starts, or does it run roughly and miss on some cylinders when it starts.

You mentioned that you replaced the spark plugs.

did they all look the same, or did some look different than the others.

Specifically .... did one or t we offer of them smell like gasoline.

 

it very sluggish kind of like its not on all cylinders but as soon as i hit the gas it idles fine with no problems fills normal

the spark plugs where really dirty and black with small chunks i think about 1-2 where not that dirty i know one was a lil grayish n black on it

yes i think the one that was gray was the only one that dident

 

Perhaps the spark plugs were way overdue for replacement.

Do you recall which cylinder the grey different color plug came from.

if so, ido like you to do an experiment.

Let the car cool overnight, or for several hours.

Remove the spark plug from the cylinder the different color plug came from.

Smell the plug. Does it smell like gasoline, or is it wet with gasoline.

I'm suspecting that you might have a leaking fuel injector.
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Is the suspect cylinder on the side close to the radiator, or by the fire wall.

How much experience do you have working on cars.

 

i think it was the back 1 or 2 from drivers side firewall

i have some experience self taught but not with this car mustangs was what i worked on but i know how to get to the spark plugs ill check the spark plugs and get back to you

 

The reason I asked was that the upper intake manifold will need to be removed to replace the injector.

Let's wait for a second opinion from another member before you go there.

Do you have access to another car if yours is down for a few days.

 

i dont know if i fixed it or not but i went and unplugged and replugged the IACV plugs and looked at fuses and i seen that i dident have a start sig fuse i put a 7.5 in and it starts a lot better

 

I'd say that you found the problem. The solution was quick and easy. Where was the fuse? On the main fuse panel on the dashboard and named start sig?

This could be useful information for another member someday.

 

the fuse was under the driver dash start sig

and one more thang what is a good obd reader to buy somthing not to pricey

and thanks for the help

 

Your welcome.

I use a code reader made by BAFX.

available on Amazon.

Android version is 20 bucks.
Apple IOS is 27 bucks.

I'm assuming you have a smart phone or laptop.

the BAFX communicates Bluetooth or wifi.

 

Sounds like low fuel pressure to me! Place a high pressure fuel gauge w/Tee between the fuel filter and the fuel rail...Your fuel pressure should be at least 43 psi while running as well. If not Fuel or fuel lines in tank are defective.

 

CMax, which fuel injection pressure Guage tester do you use or recommend.

It's one tool I don't have yet. Buying one makes sense.

 

O'Reilly has one for $75-90 Bosch, but it's better if you build your own with some brass Tees from Lowe's and a pressure gauge that is for industrial use (fuels, oils, etc) just make sure you buy stock fuel injection grade hose (5/16")....