miss/stuttering

[91waggin]

Just so we've covered all the bases here, did you replace cap and rotor when you did your tune up? Did you use dilectric grease on the plug wires?

Also, can you describe what's happening in more detail? Does it miss under load? Or is it happening at idle? How about engine temp? Does behavior change depending on engine temp?

[gadget73]

Wonky TFI module, or failing ignition pickup could do this.

[visionmercury]

cap and rotor is new even tried the ingition module too, and every thing has die grease in it. the miss is at low speeds and idle , the temp doent make a differance at all cold warm or hot, once i hit the highway it runs like a bat out of hell w/ 273 gears, in the gas or at cruse no miss or stutter. im going to do a compresion test here in the next few days, and see how that looks .( at least i have another car to drive to work but i hate my sunfire i just had the windows tinted so know one can see me in it )

[gadget73]

Try unhooking the green hose to the EGR valve and capping off the hose. I had some wierd hesitation and missing problems at low speeds, and it was a sticking egr vacuum regulator. The EGR valve was going full open when it shouldn't have. It did not set any codes since technically it was opening when the ecm called for it to open. Unhooking the egr valve made it run normal. I finally diagnosed it by plumbing a vacuum guage into the egr valve. Every time the regulator opened, the needle jumped to 8" and the car immediately ran crappy. A dose of WD40 in the regulator gave me a smooth increase in vacuum, and a variation in vacuum depending on throttle. The stumble went away.

Vacuum leaks can also do this, so can an egr valve with a chunk of carbon under it, causing it to not close. If you haven't already, recheck it for codes. A stuck open egr valve will show up there. Post the codes you get too.

[91waggin]

Maybe ECT sensor? I know it's unlikely because it doesn't matter whether the engine's cold or not, but I thought I might throw it out there as something that could be tested.

[cld783]

( at least i have another car to drive to work but i hate my sunfire i just had the windows tinted so know one can see me in it )

if i had to drive a sunfire i'd be happy nobody sees me in it.

[visionmercury]

ect sensor ? the sunfire ,i know i bought it on a whim i had a fast and furous moment and i got the car realy cheap and it has only 40k miles on it. i know its still a sunfire.

[91waggin]

ect sensor ? the sunfire ,i know i bought it on a whim i had a fast and furous moment and i got the car realy cheap and it has only 40k miles on it. i know its still a sunfire.

ECT=Engine coolant temperature sensor. Tells engine computer what temp the coolant is, and computer adjusts mixture accordingly.

[visionmercury]

duh damm ive lost my mind, i didnt think about that, i try that after i do a compression test this weekend

[85MercPark]

I have the same issue on my Lincoln and will watch how this turns out.

Gonna get the codes checked soon.

[gadget73]

I have the same issue on my Lincoln and will watch how this turns out.

Gonna get the codes checked soon.

tune up and a fuel filter. Lincolns tend to be excessively virginal, and thats not a good thing.

[visionmercury]

i just got a wild hair a checked the fuel pressure its at 30-35 w/ vac. any idea what it should be. i thought it was supose to be at like 40+, and i cant find it in any of my manuals or im not looking hard enough. so im going to replace the regulator and then go from there.

[85MercPark]

tune up and a fuel filter. Lincolns tend to be excessively virginal, and thats not a good thing.

That's my plans. Those plugs look fun to get too...

[gadget73]

eh, not that bad honestly. Flexy plug socket is your friend.

[85MercPark]

Where do you guys get your codes pulled? Autozone and Advance say no can do..