still not running right.....

[tsoccer3299]

Ok well about a month ago my car decided it would take forever before firing up when its cold. When its hot it starts right away but when cold sometimes it will fire right up but sometimes i will sit there and crank it forever. Heres what ive done, cleaned IAT, IAC, and MAF sensors, also I replaced my ECT sensor, and put in a new fuel pump. Since all of this now the car when it fires up and is cold I think it is in hot idle as the rpms stay around 600 and occasionally it will surge. It never used to idle this low when cold and hadnt done the surging before. This all goes away after a few minutes of it running. Anybody know what I should try and tackle next? Thanks again

 

[loud 95]

Ok well about a month ago my car decided it would take forever before firing up when its cold. When its hot it starts right away but when cold sometimes it will fire right up but sometimes i will sit there and crank it forever. Heres what ive done, cleaned IAT, IAC, and MAF sensors, also I replaced my ECT sensor, and put in a new fuel pump. Since all of this now the car when it fires up and is cold I think it is in hot idle as the rpms stay around 600 and occasionally it will surge. It never used to idle this low when cold and hadnt done the surging before. This all goes away after a few minutes of it running. Anybody know what I should try and tackle next? Thanks again

Have you checked your cap and rotor?

 

[tsoccer3299]

replaced the rotor awhile ago, i'll check it again. a couple of times when ive started it up cold it sounds like its running on one cylinder so i just shut it down and fire it up again. thanks for the help

 

[mo_dingo]

Did you check your fuel pressure and vacuum?

 

[tsoccer3299]

nope, how and where can i check my vacuum? i have to go out and buy a fuel pressure gauge right?

 

[loud 95]

nope, how and where can i check my vacuum? i have to go out and buy a fuel pressure gauge right?

The gauge I mounted on my Aeromotive AFPR was about $10 from summit. You can get a cheap vacuum gauge at you local autoparts store for less than $20. You can test the vacuum on any vacuum hoze if you have a T fitting. That is probably 10 cents at your local autoparts store as well. Then, you can purchase a 5 cent plug for the end of the t fitting. That way, it will be easy to check vacuum in the future. I plumbed mine in on one of the several vacuum lines on the upper intake manifold. If you come to starbucks this weekend, I'll show you the specifics.

 

[loud 95]

Oh yeah, and don't buy one of the crappy fuel pressure gauges that the automotive stores sell- the o-rings used in those are not fuel resistant! Go figure. You'll use it about 10 to 15 times before the valve assembly peters out on you. I know from experience. Get a quality gauge to mount on your regulator, or on the shrader valve. I didn't see an adjustabel fuel pressure regulator in your sig, so if you don't have one, order the bbk gauge/fitting combo from summit($60). This will allow you to mount the gauge on the shrader valve. That way, you will be able to keep an eye on that fuel pressure, to make sure you have what you need at the rail. I can show you more about this at starbucks, if you are so inclined.

 

[tsoccer3299]

yeah that would be awesome if you could show me some of that at starbucks this weekend, i'll definately be there. thanks

 

[tsoccer3299]

ttt anyone else have any ideas?