1998 Renault Clio Car that I just got

Hi there,

Thank you for your donation.

Time to get back to basics first. Check the valve timing is spot on. Compressions are good, good fuel pressure, set ignition timing as per specs, check for any vacuum leaks, no hoses fitted on the wrong pipe or disconnected. Run on oscilloscope to check ignition patterns, voltages & resistances. Fuel & air filter ok. Earth straps tight. Spark plug gaps correct, valve clearances? Lash adjusters are ok go through these and see how you get on.

Mark (mhpautos)

Try swapping the fuel injectors from 1-4 to 2-3 I am not sure if that is as easy as that, but it would prove injectors anyway, Check injection pulse at injectors first Please confirm it has been run on an oscilloscope to prove all ignition electrical. If ignition so sound, it must be fuel delivery or compression, comps ok, so fuel delivery must be suspect either injectors or pulse signal to injectors. Has the exhaust been checked with an analyzer? Running to lean, in-op / faulty injectors?

Mark (mhpautos)

Hi there,

Get the exhaust sniffer up the pipe, and check whats happening, I will sleep on it as it is 1-15 AM now (I'm in Australia) let me know what you get with the exhaust test.

Mark (mhpautos)

Hi there,

Back again, any headway yet?

The only thing I could think off was the silly basic things like, leads not crossed and vacuum leaks at cylinders. I will look at a manual today to see what shows up now here is a check list to work off, know we have already covered all this, but we are missing something here.

1 valve timing.
2 compressions.
3 fuel pressure
4 injection pulse.
5 injectors operating
6 Ignition system variable.
7 set fault codes.
8 valve clearances / lash adjusters.
9 Vacuum leaks
10 All sensors plugged in
11 Ignition timing
12 exhaust analyzer readings
13 Blocked exhaust
14 Internal obstructions in manifold.
15. Cam lobe lift on affected cylinders
16. Other damage caused by belt failure / valve strike.
It sound as if the injection pulse is out of timing or the duration is stuffed up, I don't think that this can happen on just 2 Cylinders, it is a bit frustrating some times doing this on line advise, as you really just want to have it in front of you to see whats going on first hand, we will just keep going until it is sorted.

I will re post with any other info I can think off.

Good luck,

Mark (mhpautos) Traralgon Latrobe Valley Victoria.