heyitsTaJay

its about 91degrees/60%humidity. i start my car and begin to leave school. i get into a turn around to head the opposite way and the idle is feelin rough. so im waiting my chance to turn and then get a break. as i begin to give it throttle it is hesitating to move, and then goes, and then hesitates...i give it more gas and it slowly starts to get going. i dove home and it never happened again

this has hapened b4 but was worse the first time. this time wasnt that bad. the things that came to mind were fuel filter, fuel pump, bad 02's, hot weather.

what u think?

J

heyitsTaJay

Ttt...

heyitsTaJay

popocamaro2

iTrader: (14)

i know when mine did that it was the fuel pump you could always upgrade while you are at it and if its it great if not try the next thing, i doubt its the filter

lower et then u

befor u go and change the fuel pump u should try changeing the fuel filter

VIP1

Thats where I'd start. The O2s are easiet to do so I miight try that first. The cost adds up though (4 O2s @ $50 each = $200).

frey51

if it was bad o2's you would throw and ses light? right? So I doubt it is the o2's. If you are throwing codes get it diagnosed and you should figure it out quick.

sorry couldnt be anymore help.,

heyitsTaJay

thats the weird thing. no ses light. i was waiting for it to come on and nuthin happened.

VIP1

Bad O2s, Bad Fuel Pumps, and Clogged Fuel Filters dont always throw codes.

Although it is possible that none of those are the problem. Those are just the most likely culprits.

heyitsTaJay

CAR DID IT AGAIN! it has to be the weather that is triggering this effect. its hot as *** outside. just like before. it started doing it again after i ran a few errands. i start up the car and it starts bogging down then going then idling rough then bogging down. i throw it in N and rev it up. it revs up fine then i put it bak in D and it starts chuggin along. i get out on to the raod and its driving like ****! i was hoping to throw a code and I DID. i pull over let the car sit and try driving again. does the same ****. stop the car, turn it off, and wait about a minute. start it up and its fine! so i go to autozone and the cod is PO300 multiple cylinder misfire.

what do i do now...?


J

Z'mnypit

iTrader: (58)

Check all the plugs... They are many things that cause multiple misfire..... do a search.. But I would chech my plugs first...

heyitsTaJay

but it runs fine now. if i fouled out the plugs wouldnt it continue to run like ****?

VIP1

A multiple missfire is not necessarily a permanent condition. It can come-and-go. Check the plugs and wires. Maybe there are some bad plugs or the wires are shorting or RFI is leaking in. Its also possible that the plugs and wires are fine. Other culprits are the IAT sensor, MAF sensor, and Idle Control Vavle. If it only happens on very hot days, then bad readings from the sensors or a badly operating idle control valve can cause a bad idle and part throttle. It may confuse the computer and cause a misfire (this is a guess).

heyitsTaJay

RFI? will the plugs be black if there bad? is the weather playing a part in this?

VIP1

Radio Frequency Interference

Its the Eletromagnetic Noise that the shielding on the plug wires is supposed to filter out (lessen anyway). If the casing has gone bad then the plugs could be arcing or if the caseing isnt that bad, RFI can leak out and interfere with other wires and cause audible noise in the radio.

heyitsTaJay

i see...would it be alright to get plugs and wires from autozone?

VIP1

There are others here that can better answer plug and wire selection. Plugs and wires from AutoZone aren't bad, they just may not be performace editions like Taylor 10mm wires or NGK plugs. Although there was a thread in which someone said that AC Delco (or another brand starting with "A") used rebadge NGK pulgs.

VIP1

Here is a site on how to read spark plugs:
http://www.densoiridium.com/howtoreadusedplugs.php

I did some searching. Many people recommend TR55 (stock# 3951) for N/A and TR6 (stock# 4177) for Nitrous motors. Some also recommend Denso Irridiums. AC Delco (stock) and Bosch +4 are a toss-up. Some love them, some hate them. They work and they are available from AutoZone. If you need pulgs now, then a set of Bosch premium wires and +4 plugs should be fine and last longer (although not really performance oriented). Here is a link so you see what I mean: https://ls1tech.com/forums/showthrea...ight=delco+ngk

heyitsTaJay

thank you for searching. i searched and found nuttin. if i autotap it could i start to diagnose the problem quicker?

VIP1

I added more to the end of my post above.

Autotap (ot other logging software) will help. I have no experience with it, so I cant help you on how to use it.