crashlz

My truck is missing really bad at all rpms i have tried replacing plugs, wires, fuel and air filters. only code im getting is a random multi cyl missfire. i have checked the fuel pressure at idle im getting 48 which ive read is low so tomorrow im going to get a used pump to see if it helps or not but any other suggestions would be great

whether it is relevant or not im unsure. 2 months ago i lost 3rd and 4th in my transmission and i pulled it apart and replaced the 3-4 clutches with 9pack i got from Oregon Trans. Since then ive had 3rd but no 4th i went back through the valve body to make sure i put everything back in right and all is good.

lady3bglover

iTrader: (3)

Did you check to see if it's coding?

crashlz

im going to assume you mean check for codes...

darnie

iTrader: (1)

A code P0300 may mean that one or more of the following has happened:

Faulty spark plugs or wires
Faulty coil (pack)
Faulty oxygen sensor(s)
Faulty fuel injector(s)
Burned exhaust valve
Faulty catalytic converter(s)
Stuck/blocked EGR valve / passages
Faulty camshaft position sensor
Defective computer

i would start off by checking all ur connections, wires ect, if that dont do i would unplug the map, spray elc cleaner on it and clean the connection, if that dont work shoot me a message ill see what else i can come up with gl dude

crashlz

unsure of any special way of testing injectors or coils...so i unplugged 1 by 1 and could notice it running worse. the maf i had cleaned about 1mo ago when this started. spark plugs are brand new ngk tr55 that i put in when this started. oxygen are about 1-1.5years old thing i still have my old ones laying around to see if it helps.. i checked my fuel pressure again key on i see 50 and it drops to 48 within 30second or so when idle it is 48 when i rev motor i see 58 im thinking it could be the cats wish i could see em without cuting em open to know for sure.. i cant just buy parts to see if it works unfortunately work is very slow=no money

EDIT: just to better clarify it is missing at idle...truck is shaking and at 3000+rpm or so the CEL starts flashing.. and with the injectors im unsure how exactly it should react to 1 being unplugged as it is already running bad but thanks for posting darnie..i will eventually get around to getting parts to see what fixes it

david0982

iTrader: (3)

Misfires suck used to have problems with that all the time.

Mrgoodwrench3

What is all that Red wiring for? Do you have a digital thermometer gun? You need to determine what cylinder is missing. Then you can proceed. Possible coil, injector, valves.

crashlz

yeah i dunno all this started about 1mo after i replaced the 3-4 clutch pack and i still don't have 4th and no idea why...i wonder if something in the transmission could cause this?

crashlz

i can get a temp gun from a buddy and see what the temps are. red wires are the big 3 upgrade for my 2 amps i run

crashlz

not sure how accurate the temp gun is Raytek MT6..i tried to hold it about 1in away from from exhaust manifold and pointed at about 1/8 from the flange as the heat shield is still on them...
at 1in away ...... ... at 4in away
1 - 200F 2 - 380F ... 1 - 239F 2 - 230F
3 - 368F 4 - 218F ... 3 - 280F 4 - 235F
5 - 218F 6 - 215F ... 5 - 240F 6 - 245F
7 - 210F 8 - 220F ... 7 - 245F 8 - 235F

i dunno go out and check em again and get 220ish on all but #3 which reads 340ish each time i check em i get different. used timing light to check if all are getting spark and yes they are. if i can get a compression check kit im going to check that in the next few days

EDIT: checked compression im getting 160 on 6of them and 155 on 2of them. pulled the map cleaned it put it back no change. when i did the compression test all the spark plugs looked normal