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The relays allow a small switch to control a large current. The fuse box and relays are in one place as many connections are common and also make it easy to find the fuses - imagine having single fuse …

Performance tuning changes the fuel delivery and other things like the ignition timing to develop more power. This is fine, but when certain countries set emission standards of x at y rpm then due to …

Timing, fuel delivery ie what is called the characteristic map. If you want to get to grips with this, read up on the early engine controls such as the J and K systems by Bosch - these were simpler th …

Yes, many ways, one being replace the dash cluster. For the codes, once they are cleared then they are gone... I have chatted with garages and one with dealer level readers and once cleared...

Yes, paired injectors is one solution, but have you looked for standalone ecu's with more outputs? It does affect the fuel use obviously, as only one cylinder is firing while the other is closing exha …

There are 3 options: 1) use the ecu matching the engine 2) purchase a third party tuning ecu and get it programmed to suit 3) have a tuning company re-program the existing ecu from the old engine - …

Based on experience of other plugs, you need to make a small implement that will slide into the little rectangular slot next to the connector square hole with the wire that you want to remove - the id …

So, not sure from your question if you have had the work done or not, but it won't affect the answer. The new (or good second hand replacement) will need to be programmed to the vehicle as it needs t …

You need to put your battery on charge for at least 24 hours with a decent mains charger. Once the battery has a proper charge (and 45 minutes won't do it) then you can re-evaluate the other problems …

Experience with other vehicles means you will need the computer / linkcable / software (not an aftermarket one but usually a dealer level) that matches your vehicle and that will be able to code your …

I would suspect that it was the dealer's system / ecu flash attempt that killed your ecu. My evidence - being a member of the jaguar forum where similar things have happened : a small update that fail …

If the relay is not defective, then I would check for any chaffed or damaged wires under the bonnet or under the dash - this could cause the relay to energise. One other possibility is someone has mis …