lexus es300 cranks won’t fire, weak spark, intermittent injector pulse?

I've been having a hell of a time with this es300. I got it in the beginning of march 2009, and since then have had to have the water pump and timing belt and gasket replaced, and then recently, I ran out of gas on the highway and the fuel pump went.

The day the fuel pump before i ran out of gas i had a situation with the car just starting in general. I let it sit for a few minutes then it started. Later I ran out of gas, someone came and hooked me up, it started and I went home. Then a few days later I went out to try to go somewhere and the car just wouldnt start.

I went to a junkyard and pulled a fuel pump, bought a new fuel filter and put all that in. I know the pump works because I can hear it when i put the car into the on position.

Basically, the car cranks, but will not fire at this point. We checked the fuel pressure, its great, then we checked the spark plugs, that doesnt appear to be the problem either. The injector pulse was intermittent, and the spark we got from the plugs are weak.

We are basically at a loss trying to figure out what next to check. We were thinking crankshaft position sensor or the ecm could be bad. We tried to manually get the check engine codes (however at no point before it died did a check engine light come on) and it didnt even blink or anything.

Does ANYONE know what we can do before we go out buying random parts to replace and what possible diagnostics we could run? Or is there something we aren't thinking of?

Note, I also put a new battery in it about a week or two ago. Any advice would grant you title as hero of the day.
all the wiring looks fine, nothings burnt or in bad shape. Whats really raising the red flag is there's no check engine code when we tried to retrieve it. We followed the instructions to jump the terminals in the diagnostic block in the engine compartment but it showed nothing. it didnt even blink and from what we read in the manual it should blink twice a second if there are no engine codes.

How can i test to know whether its cam crank or ecm?
we actually verified the belt isn't broken but havent look at time.

our guess was also possibly the computer but getting to it is a real problem without tearing stuff up a little bit. this car is put together all retarded-like.

Author: Eranio on November 5, 2009
Category: Used Fire Engine
Tags: , , , , , , , , , , , , , , , , , , ,
4 responses to “lexus es300 cranks won’t fire, weak spark, intermittent injector pulse?”
  1. jayt says:

    nope your on the right track, i would go with the crank positon sensor, but before are the wires in good shape and the plugs?

  2. Scott W says:

    could be a bad cam or crank sensor or ignition coil.

  3. greengiant says:

    computer?

  4. God XLVII TCR3 says:

    The timing belt change was probably botched and mismatched a belt tooth or two. Poorly executed timing belt changes often screw up other things down the road such as cam timed events, like ignition and fuel injection sychronization. You will not get engine codes to tell you this.

    If your distributor cap and rotor are fresh, this can help to smooth out the timed events mentioned above by adding tolerance to the firing sequence. Replace the distributor cap and rotor. Now is a good time to replace the wires also, since you will be pulling them. Also, make sure the wires are going to the correct cylinders. You may need to rotate the distributor a little to clean up the timing, but do the cap & rotor first. I had an ES250 with the same issues. Don’t mess with the ECU or crank sensor. It’s a Toyota.

    Even if this does not remedy the problem, it won’t set you back much $ or time and it will be good for your car no matter what.

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