Freelander 2 (LR2) Missing at 2000rpm

Hiccups or misfiring can often be put down to the crankshaft speed sensor failing. Regular misfiring, particularly under load is normally an injector on the way out.

Nodge68 said:

Hiccups or misfiring can often be put down to the crankshaft speed sensor failing. Regular misfiring, particularly under load is normally an injector on the way out.

Click to expand...

Changed cam and crank sensors no faults when plugged in only egr flow but that's blanked off

tonylandy123 said:

Changed cam and crank sensors no faults when plugged in only egr flow but that's blanked off

Click to expand...

Cam sensors never fails, and wouldn't be responsible for misfiring as they're only used at startup. Crank speed sensor is normally the cause of missing, but seldom shows on a diagnostic unit it fails completely.

What make was the replacement speed sensor? There have been instances of cheap sensors being worse than failing OE sensors. The plug can also suffer bad connections, where the pins have splayed. I've had to replace the plug, as it wasn't connecting correctly, causing sensors to fail very quickly. I've had no issues since fitting a replacement plug and new OE sensor.

Injectors can also cause misfiring, particularly after they've done 100 to 120k miles.

Nodge68 said:

Cam sensors never fails, and wouldn't be responsible for misfiring as they're only used at startup. Crank speed sensor is normally the cause of missing, but seldom shows on a diagnostic unit it fails completely.

What make was the replacement speed sensor? There have been instances of cheap sensors being worse than failing OE sensors. The plug can also suffer bad connections, where the pins have splayed. I've had to replace the plug, as it wasn't connecting correctly, causing sensors to fail very quickly. I've had no issues since fitting a replacement plug and new OE sensor.

Injectors can also cause misfiring, particularly after they've done 100 to 120k miles.

Click to expand...

Both botch plus new one fel

Nodge68 said:

Cam sensors never fails, and wouldn't be responsible for misfiring as they're only used at startup. Crank speed sensor is normally the cause of missing, but seldom shows on a diagnostic unit it fails completely.

What make was the replacement speed sensor? There have been instances of cheap sensors being worse than failing OE sensors. The plug can also suffer bad connections, where the pins have splayed. I've had to replace the plug, as it wasn't connecting correctly, causing sensors to fail very quickly. I've had no issues since fitting a replacement plug and new OE sensor.

Injectors can also cause misfiring, particularly after they've done 100 to 120k miles.

Click to expand...

Both are bosch plus new ome fuel filter checked wires on loom and plug look fine is there a easy way to check injector with out removing them

Unfortunately the ECM doesn't output injector compensation values for injectors, so it's difficult to tell which one if any are misbehaving.
I ended up swapping them out one at a time until the faulty one was found. I eventually decided to simply replace them with new ones though, as I needed the vehicle to be reliable.

Nodge68 said:

Unfortunately the ECM doesn't output injector compensation values for injectors, so it's difficult to tell which one if any are misbehaving.
I ended up swapping them out one at a time until the faulty one was found. I eventually decided to simply replace them with new ones though, as I needed the vehicle to be reliable.

Click to expand...

How mutch were they ill have a look see if can get some before I go down the road of taking them out and getting tested

tonylandy123 said:

How mutch were they ill have a look see if can get some before I go down the road of taking them out and getting tested

Click to expand...

Initially I bought a working set from a scrap engine to prove one of mine was faulty. I drove it for about a month with those without a misfire, so it proved there wasn't another issue.
I then bought a set of new injectors, which were about £180 each.
Don't buy "reconditioned" injectors, as these injectors can't successfully be reconditioned, which I know as mine came with reconditioned injectors when I bought it. I don't believe they can really be tested without very expensive test equipment, as they are designed to give several injection pulses per firing cycle, which conventional test equipment can't do. The only real way to get them tested, is to send them to a Bosch center, where a test costs about 30% of the price of a new replacement, so for me that was just a waste of money, which I felt was better put to a new set.
Don't forget to factor in that the ECM needs the injectors coded to function correctly.

All this is assuming that you've not got another fault in the system, like a boost leak in the intake. These engines are very sensitive to air leaks, even blanking EGR valves can give issues. So it's important to check absolutely everything before going down the injector replacement route.