Engine misfire or flat spot when accelorating put occasionally

Poss bad plugs, clogged injectors, clogged exhaust, crank or cam sensor. Have to read the ECM & read the specs to see whats happening.

If the is misfiring then the check engine light will blink and a code will be set for the fault, so if you have no light you do not have a misfire it has to be something else going on, have you had the fault codes read yet? Do that, any Autozone will read them for free, just ask for a OBD2 fault code test.

the flat spot is a missing instruction in the CPU program in the ECM. Run the fault codes to check for faulty sensors or have the CPU program reset using the scanner. Loose wires would give a problem all over and not just at particular rpms

if the electronics are all good than need to look at the injector pouring in a cleaner wont fix if injector is damaged or internally damaged

You might want to check this site for some tips and solution.

Misfire Hesitation Please Help

Check for fault code sensor around air temp sender unit..Check for vacuum in tank from purge valve fault or faulty cap.

All fault codes can be checked out at http://www.bluejag.co.uk but here are the results for some of yours. You can ignor P1111. Looks like a faulty plug or coil pack cylinder 2

Fault Code:- P1314 Indicates a Power-train fault


The fault is generally due to a problem in the Ignition or Misfire area


Fault Description: Misfire rate catalyst damage -bank 2 NOTE: This DTC will flag only when accompanied by an individual cylinder misfire DTC: P0300 - P0306

Action of ECM:- ECM Default:- Maximum engine speed reduced


After clearing the DTC, complete the Misfire monitor drive cycle
Check for a reoccurrence of fault DTC.

Possible Fault:- Cylinder compression low Worn camshaft / broken valve spring(s) Fuel delivery pressure (low / high) Fuel injector(s) restricted / leaking Fuel injector(s) continuously open Fuel contamination Fuel injector circuit fault(s) (Injector DTCs also flagged) Spark plug failure / fouled / incorrect gap ECM to ignition coil primary circuit fault (Cylinder misfire detected DTC also flagged) Ignition coil failure
Fault Code:- P1316 Indicates a Power-train fault


The fault is generally due to a problem in the Ignition or Misfire area


Fault Description: Misfire excess emission NOTE: This DTC will flag only when accompanied by an individual cylinder misfire DTC: P0300 - P0306

Action of ECM:- none


After clearing the DTC, complete the Misfire monitor drive cycle
Check for a reoccurrence of fault DTC.

Possible Fault:- Cylinder compression low Worn camshaft / broken valve spring(s) Fuel delivery pressure (low / high) Fuel injector(s) restricted / leaking Fuel injector(s) continuously open Fuel contamination Fuel injector circuit fault(s) (Injector DTCs also flagged) Spark plug failure / fouled / incorrect gap ECM to ignition coil primary circuit fault (Cylinder misfire detected DTC also flagged) Ignition coil failure

Fault Code:-
P0302 Indicates a Power-train fault


The fault is generally due to a problem in the Ignition or Misfire area


Fault Description: Misfire detected ?€" cylinder 2

Action of ECM:- none


After clearing the DTC, complete the Misfire monitor drive cycle
Check for a reoccurrence of fault DTC.

Possible Fault:- Refer to P0300 Possible Causes

is the check engine light on? o2 sensors will set an engine code as well as set for lean or rich conditions. being a 2004 model if it is an engine misfire condition this also should set an engine code. most likely with the symptoms you have you have a plug wire getting a bad spot in it. as the engine gets hot the plug wire will cause an engine misfire.

The blinking light means that the cylinder or cylinders are misfiring, the first step is to see if it needs a tune up, bad plugs or wire will cause this. if you go to an autoparts store and have them scan the computer , they will give you a print out of the codes, i will bet theres a few misfire codes. the codes will tell you exactly what cylinder is actting up and from there you can check the wire and plug.

need fault code to fix /post fault code