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is it a6 cylinder? Its ignition fault check spark plugs, spark plug wires, distributor cap, and rotor, if it has one & check the coils or coil packs).
just type the error codes into google and you get hundreds of hits and ideas of what to check
Po300 is a multiple random misfire there several things that cause this GM had an issue with the coil wire arcing to the transmission dipstick tube the new routing is to go over the plugs and remain on the inside of tube (old way was behind) USE a new wire. #2 dirty fuel (water contamination) As for the p1345 code this could be caused by ignition arcing inside Distributor Cap I would suggest replacing cap and rotor Clear codes This code will set once engine has gone over 1000 rpm's it updates every time to get spark advance correct if sets again distributor has moved this can be reset with a gm specific software scanner under camshaft offset specs 0 degrees to +4 max.
P0305 is a misfire on number 5 cylinder replace spark plugs, wires cap and rotor button. Please note: Does the ac cooling line/hose go over top the distributor ? If so GM/CHEY had a problem when dripping from that AC line/hose dripped down onto the distributor. That caused miss fires after a time. I hope this helps, Lee.
Cylinder #2 is the the second spark plug counting from the right to left.
EX.Below are spark plug on engine
' (oil cap) '
' (4) (3) (2) (1) '
Your misfire can be cause by couple of things but the cheapest way that you can try to fix your car is to do a tune up by replacing:
1)all spark plugs
2)do a oil change
3)spark plug wires
3)distributor cap and rotor
note misfire can be cause by:
2.spark plug and/or wire
3.distributor cap and/or rotor
8.bad wiring(power, ground or feed line)
depending on what motor is in your Jimmy and if it still has a distributor, that is where i would start. moisture will get in side the distributor and cause a miss fire. This is a common problem with GM trucks that still have distributors instead of coil packs. Try haveing some one replace the cap and rotor or silicone around the cap and see if it seals.
Well, First i would have replaced all of the spark plugs and the wires, Then moved to the cap or rotor second, but in that case, did you check the spark plugs and wires, when was the last time they were changed? Maybe they were changed already and that's why you when straight to the distro? Is there a computer code for a misfire, or it feels like a misfire when it's running?
Go to Auto Zone and have the Suburban scanned for DTC codes, Auto Zone scan for free and most Auto shop will do it for $10.00 to $20.00 since they want your business cause they know most large Auto Parts store scan for free.
It sounds like you have a miss fire which can be caused by and O2 sensor or dirty MAF sensor which can be cleaned or time to replace the rotor and cap, plug wire and spark plugs.
Note that the distributor cap and rotor is made of plastic and is know to crack do to time and heat. There is also a rubber valve or screen at the bottom of the distributor that get's dirty and the inside of the distributor collects with condesation and corrode the rotor and caps too.
Good luck and hope this helps, Get it scanned and see if it's a sensor that is causing the miss fire on the hightway. If not then replace the cap and rotor and clean out the distributor if needed.
Inspect the plug wire and replace if needed and change the plugs.
misfire :-------- try checking your 02 sensors /fuel pump and filter. for 51 cylinder misfire :---
Change the coil. Period. Very easy to remove from the vehicle if it's a 4 cyl. Follow that spark plug wire from the spark plug to the other end. What it's attached to you should replace
for 54 cylinder 5 misfire :---First you have to eliminate the most obvious problems, like spark plug and spark plug wire. If you replace those and you still have a misfire, then it's a good idea to look for a vacuum leak in the intake manifold
The couple across the street from where I live, had the same problem. He also changed plugs and wires and even the coil. I told him to replace the rotor bug and distributor cap and all started running smoothly again. Looking at the bug and cap nothing looked bad other than a little wear. It even checked out using a meter. Only thing I could think of was that there may have been some hairline crake robbing the spark and causing it to missfire.... Don't really know.