90Mustangfan

What is causing my car to miss.It only does this when I first start up the car, then it goes away. It will miss and make louder pop like a backfire. then it goes away, bascily when ever I start the car it will do this. then It goes away after like 5 min or so, What could be causing I made sure all the elecrtical stuff is pluggged in. Could this be an electrical problem or a gas problem, timing too high, Any Ideas will be welcome, I need help bad, I tried cleaning the Iac and cleaned the maf what else can I trie, Im desperate.

Quatrocky

wait thats what mine started doing today!

Jayson95GT

My car does something similar. When you cold start it, you somtimes have to turn it over for awhile, and it runs a little choppy and sometimes it will even pop like a backfire. Then, after the engine gets up to proper temperature, it smooths out for the most part (still doesn't seem to run perfect though). I checked the plugs/wires and they look pretty good and the IAC and Mass Airflow are fine.

After looking it up in a Haynes repair manual, my hypothesis is the fuel pump. It listed the fuel pump in both troubleshooting categories of starting hard when cold and for idleing choppy. So the fuel pump is my guess, but i am no expert lol.

Quatrocky

thats exactly what happens to mine, in my other post i was thinking its the fuel pump...i hope not though arent they expensive to install....?

stanglx2002

i dont think its the fuel pump it goes away after it warms up. 302's dont like cold starts. i have had 2 and have been working on them for 13 years and thay all have problems with cold starts. they just do that.

Jayson95GT

Well, they are located inside the gas tank[&:]. I have never dropped a tank by myself before, but I have helped other ppl do it at my High School Auto shop and it can be a real pain sometimes. We have hydraulic lifts there though which made it alot easier. I would hate to do it on a kreeper. at autozone.com they range from 80-100 bucks for a new fuel pump. I'm not positive its the problem though which is why I havn't done it yet.

Quatrocky

yea the problem is this time it hasnt gone away, it usually does. Somone also told me maybe the fuel filter*, which ive never replaced...

Demon_Mustang

Well, to make your life easier, if you feel like changing your fuel pump, simply do it after running your tank to almost empty. Trust me, an empty tank is many times easier to drop than a full one, lol.

Quatrocky

i just called the ford dealerhip, and they told me that its the spark plugs, he said the fuel filter and pump dont have anything to do with the backfiring and such...

stanglx2002

what spark plugs do you use and whats the gap?