Loss of power, popping at 2000 revs, exhaust smoking...

Hi all,

After a bit of diagnostic advice if possible please? Over the past couple of months had a few issues where the car was misfiring. I had all six spark plugs changed, during which I noticed a lot of oil, cleared all this up. The misfire was a lot less, although still there, more so when the car was stationary. A few weeks afterwards noticed the the exhaust popping then came the loss of power, found a crack on the front part of the exhaust downpipe, this was sealed up by welding it, yet the car still has the loss of power, exhaust popping at 2000 revs and exhaust smoking with black smoke,The seals on the spark plugs are fine, the gasket on manifold ok, so not sure what else it could be, maybe a blockage, but cant see anything ,the exhaust smoke is sooty, quite rich..? Appreciate any opinions, assistance, anything..!

Thanks in advance

Raks

Have you checked for any stored engine codes? Engine Codes

I'm asumming this is on an NA? If so then take a visual check over:

a) Is your map sensor still connected? Is the vacuum hose from the inlet still connected to the map sensor?

b) Get a timing light on the car and check that your distributor hasn't loosened and is alterating your base timing.

c) Check your HT leads are connected in the correct order to your distributor.

d) If you don't get an engine management light (yellow engine warning light) then could be a sign of your ECU being on the way out which can cause random issues like this.

Try a different ecu before messinf with anything. I spent stupid amounts of money on everything else first.