I have a 99D1 4.0 that I replaced the fuel pump in. The rover only has 92 k on it. At idle it runs great, no pecking, knocking or ect. How ever when I drive it begins to backfire in the intake plenum at around 30-35 mph. I am at a loss please help..
sorry its been a few days. (work the rover seems to run fine till it comes up to temp, then there is a slight pecking sound, then it progresses into a full miss and knock. I am now suspecting a crank sensor is at fault as the problems seem to only do this at at normal operating temp. once the rover has had a chance to cool down the problems go away and the cycle repeats itself.
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