[warrior86]

alright, I need help trying to figure out what may be causing the following issue of mine.

Whenever I start up from a cold start, it fires up beautifully, nice and strong, powerfully... shoots up like 2K and comes back down and idles where it should and stays on 800 or so without fluctuating back and forth.

Lets say I am on my way to work or somewhere and i turn off the car. A few hours later I go to lunch and at this point its quite hot outside. The car turns on fine again normally. Now after I have driven it, arrived at my destination, etc, and get back in the car after 20 to 40 minutes, and want to start it, it starts up barely and feels like she is going to die, stall out, etc. the RPMs dont go past 900 when you turn the key and then just fluctuates way below what the idle should be like down to 400, and then back up, and back down...

I would at this point give it gas to keep it alive and going and then i pull out to reverse and then into drive and start driving. After I get the car going, there is no problem, there is no loss of power feeling when at lights or anything, only when i start it up on a warmer engine time to time.

I've never experienced this until maybe 2 months ago. Car has roughly 90K on it, changed the the sparkplugs, spark plug wires, cleaned the CAI, cleaned the IAC valve with throttle body / intake / carbon cleaner, all the fluids seem fine.

I seafoamed her not too long ago, but through the brake booster line, not the intake valves that cover the rest of the cylinders (that will be my next step in about 1000 miles). I am going to clean the MAF sensor soon. Battery is strong.

As far as the PCV valve being replaced, would that help?

What do you guys think would be causing my problem? If it was some kind of vaccumm leak or exhaust leak I would think I should be getting that startup issue everytime I start up, and not just when the engine is intermittenly warm. I know it is very hot here in south florida, but I've noticed it on not such hot days (the rare times we get them) and at night time sometimes when the sun isnt out.

any suggestions are welcome!

[stephen]

It sounds like a leaking injector, which is building up fuel in the intake after the car sits for a short time. After it gets going the excess fuel burns off and it runs normally. If it sits for a longer time the leaked fuel evaporates.

One thing to check is fuel pressure in the fuel rail, which can be checked by opening the bleed valve. If there is pressure right after it has shut off but not 15-20 minutes later and you have the starting problem that indicates an injector leaked.


You might want to remove the injectors and have them tested off the car. One place that does this is Witchhunter Performance.

[Onemanzu]

you should check to see what idle and air intake sensors you have and then give those a good cleaning. If the problem still exists, take it to a mechanic that does free appraisals for there work then bail out saying, "wow, i was thinking it was a dirty filter or something, I need to go talk with my bank" and never show back up.

[warrior86]

are 19lb fuel injectors the one to get IF i needed replacements for 97 v6?

[warrior86]

btw.. i been hearing alot about it maybe being the TPS sensor.. is the following picture the TPS in my car?

[dgt_mustang]

if thats your throttle body and your talking about the black piece there yes, not the other thing in the far left, thats the vacumn solenoid.

[warrior86]

yes the black piece in the middle. thanks

[dgt_mustang]

np