I recently bought a used 97 range rover se and getting a problems. It emits black smoke and when i ran an obd test i get codes p1316 p0102 p1187 p0137 p0304 p0103 i installed new spark plugs and wires. When i pulled out the plugs they were all black. I also ran a compression test and all cylinders were between 9.5-10.5 except for #4 which got a 8.5. And another thing,everytime I start the car it makes a loud slaping sound right as it fires up. Let me know what you guys think.
The P0304 is a misfire directed at #4 cylinder. I would need to check out the vehicle to even get an idea sounds like to much is going on to know for sure from here. Where do you live? Maybe I can find a Rover Tech in your area. I'm in the bay area in California. Have you cleared the codes after repairs made?
Well I cleared the codes and took it for a drive. None of the codes came back but I still got a P1179. I took out the MAF sensor and it looked clean so i just blew off a little dust and put it back in. I restarted the car and ran the test again and this time i only got the p1316. So i took it out again and drove around and now no codes are showing. I doubt the problems are fixed but Ill keep you updated if things change.
If you have had the transmission out of this vehicle or the engine out there is a chance the reluctor ring was damaged and some teeth aren't straight. If you get a 1316 or 1317 code all alone most likely the teeth are bent and the ECM is geeting false info. This could cause a #4 misfire also because the teeth next to the torque converter bolts happens to be the #4 cylinder(i know from passed experiences. I have fixed many vehicles that had no problems other than this issue. Make sure there are no vacuum leaks or exhaust leaks before the O2 sensors. Where is the vehicle are you close to california???
Im in lakestevens, WA. So far I havent been getting any codes and it drives fine except for a bit of smoke on a cold startup. I took it to autozone for them to scan the ecu to see if they get a signal and it shows cylinder 4 missfire.
I wouldn't freak out over a little smoke at cold start up. I had a customer that had a rear main seal done at another shop. She had a #4 misfire for over a year and no matter what the other shop did it still came back with a #4 misfire. The first thing I did when she brought me the car was remove the inspection plate in front of the torque converter and found bent teeth right next to one of the torque converter bolts. I realigned the two teeth and checked the rest of the teeth to be sure no others had been bent. Those were the only two bent and she never had the light come on again for a #4 misfire. She has been back ever since and loves us. It cost her $125 to fix a very expensive ongoing problem.
