hey thanks for your reply,tomz wrote:My suggestions.
-Try spraying aerostart whilst cranking to see if it fires to rule out spark related issues.
-Pull the plugs are they wet ?or really dry ?...if wet maybe flooding is occuring or fuel pressure is too high.
-Check fuel pressure to confirm pump and regulator is working correctly.
-Compression test on all cylinders will rule out major cam timing or bent valve issues.
-Hook a test lamp to one of the injectors to see if they are pulsing
if its putting fuel in their and sparking at close to the right time it should run
anyhow thats how i'd tackle it . if the pump kicks on for a couple of seconds when you turn the key on the ECU is most likely working OK
From what I understood, spraying aerostart proves if it is a fuel related issue or not. I have done this and no, it didn't change anything.
The plugs seemed wet, and yeh I thought maybe fuel pressure was too high as always smelt really rich, but after replacing the fuel pumps it no longer smells rich but still have the same issues. but do you think I should check the fuel regulator? one of the few things I havnt replaced yet.
I have used a fuel pressure guage before and seemed correct pressure and definetly wasn't too high, this was before I replaced the 2 fuel pumps though.
I have a noid light and all injectors seemed to be pulsing at the same time the plug is firing (well when I say all, i think i checked 2 or 3), but now that you mention it I should probably test them all just to be sure. but how crazy would it be that some cylinders aren't doing what the others are? I am doubtfull here, as an auto elec has checked everything over.
compression testing revealed although the engine is somewhat tired, there should be enough compression to make combustion at around 120 psi or a little less depending, and very even across all 8....however a freshly rebuilt block should be making around the 150-160 psi I believe so obviously down quite a lot in this regard.