| Author | Message | ||
     Jason McCombs (Jasonmc) Member Username: Jasonmc Post Number: 104 Registered: 06-2003 |
Hey guys i bit the bullet and bought myself an Innova OBD code reader becuase the "check engine" light came on for a second time and for $99 dollars i can read it myself now. so my codes are P0300 - random misfire detected and P1316 Misfire causing excessive emisions. OK so i know the first thing that comes to evceryones mind is valves right? yeah it comes to my mind to but i have had the rover for like 7 or 8 months and it never happened until i changed the spark plug wires and the plugs. i know i didn't crosswire the cylinders i did one wire at a time. i was cautions on the spark plugs i used anti-seize, and the dialectric grease. Could it be my new wires? i am not sure of the brand i oredered them form rovers north. They arent the magnawires that i have heard recommended on here before. and i know they arent OEM, the rovers north folks told me these were a bit better then the OEMs, maybe that was a sales pitch and now i have crap wires. I know it could very easily be the valves but i just supect the wires because it happened for the first time a few days after i changed the wires. any advice you guys might have will be greatly appreciated. I am hoping to avoid the $2000+ cost of a valve job during the holiday season. thanks in advance for your help | ||
| Jason McCombs (Jasonmc) Member Username: Jasonmc Post Number: 105 Registered: 06-2003 |
one other thing about a month ago i lost my original gas cap. i bought a stant replacement but they did not list the discovery in they cap selection guide they only listed the range rover so i went with that one. if im not getting a good seal on the gas cap would it aid in giving me th eexcessive emissions code? | ||
| Jaime Crusellas (Jaime) Member Username: Jaime Post Number: 161 Registered: 05-2003 |
I betcha its one of the sparkplug wires. Go around each one and make sure its making solid contact. Sometimes the rubber boots are so tight they grip the plug a bit high and the metal ring inside the wire does not make full contact with the plug. | ||
| Jim Lupinetti (Jims95) New Member Username: Jims95 Post Number: 4 Registered: 08-2003 |
When I bought my wife her 1998 Discovery 4.0(Land Rover Certified Vehicle), it was running a little weak, compared to my 1995 Range Rover Classic SWB 3.9. I put in Bosch Platinum 4 Spark plugs with Magnecor Wires, like I had in my Range Rover. The old spark plugs were shot. It ran so much better, but the "Check Engine" light came on. I took it to the dealer, and they told that the "misfire" code came up. The dealer installed the stock Champion Spark Plugs, and the problem went away, and it was running much better than we first got it. I asked the dealer why I wasn't having the problem with my Range Rover. They told me that the OBDII System for the 4.0 was more sensitive thatn the OBDI system for the 3.9. The dealer and some of the independent Land Rover shops also told me that this is common on the 4.0, and that they pull out the spark plugs and put the stock spark plugs in. Also, OBDII does not like it when the gas cap is not fully tightened. It happened to the Discovery earlier this year with the "Check Engine" light coming on. I tightened the cap, and had to drive it around for a few days before the "Check Engine" light went off. In other words, it required a number of "warm up" cycles before it reset itself. Hope this helps. Jim Lupinetti | ||
| luis cardon (Luisc8) New Member Username: Luisc8 Post Number: 14 Registered: 10-2003 |
try what jamie said.... then try new plugs... I went with the platinum 4 plugs that are pre gapped... I had a simular problem and a new plug fixed it |
