Slight engine stumble after 20 miles highway driving
#1
Slight engine stumble after 20 miles highway driving
I i have a 2001 s type 4.0 with 85K miles. California car for 16 years now on East Coast. When I drive the car on the highway it starts and runs great. After about twenty miles at highway speed (55-65);When I stop and rpm drops to idle speed of about 700 rpm the engine surges up and down about 200 rpm but does not cut off. Usually when I accelerate it’s fine again, but today it continued to stumble through the gears up to 55mph. I stopped for about thirty minutes for lunch and started home again. Engine ran perfectly the entire return trip of about fifty miles and several stop lights. Wondering if maybe I have a dirty injector? I run 93 octane only. Also wondering if the car going from SoCal weather after 16 years to the heat and humidity of coastal va might be trying to reprogram the computer or fuel air management system? I’ve only driven it about 400 miles in the last eight months of owning the car and it is garage kept. I’m new to jaguars so forgive any simple oversights on my part. Thank you all very much
#2
Not likely an injector. Even less likely the computer (PCM). No point at all in reprogramming it.
Start by watching fuel trims - use Search and read a bit. Chances are an air leak.
BUT VITALLY - HAVE YOU CHANGED THE TIMING CHAIN TENSIONERS???? Your engine is on borrowed time if they need doing!
Start by watching fuel trims - use Search and read a bit. Chances are an air leak.
BUT VITALLY - HAVE YOU CHANGED THE TIMING CHAIN TENSIONERS???? Your engine is on borrowed time if they need doing!
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Wfmurphy49 (07-06-2018)
#4
Timing chain 4.0
w myrphy
hi there. Did you complete the chain gang replacement? Mine was sussessful. Note I used Christopher’s foreign car imports aj v8 full kit replacement. He is on eBay. It is a full replacement kit. Chris was great to talk with and helped me with a few technical points. Chris formerly had a Jag shop. Don’t forget to install the dime sized o rings on the vvt cam holders. They go between the holder and the block. Mine had fallen off when removing the holders and I did not know where the last two o rings went. Use vasoline to hold them in place. Note I had to remove the oil filter housing to slide off the crank damper. One of the pipes was in the way. So buy the figure 8 gasket to re install. This is the only gasket not in the kit. See my pictures and write up which I posted. 52 hours all in. However I had some rework because I had to find where those two o rings went. Best John
hi there. Did you complete the chain gang replacement? Mine was sussessful. Note I used Christopher’s foreign car imports aj v8 full kit replacement. He is on eBay. It is a full replacement kit. Chris was great to talk with and helped me with a few technical points. Chris formerly had a Jag shop. Don’t forget to install the dime sized o rings on the vvt cam holders. They go between the holder and the block. Mine had fallen off when removing the holders and I did not know where the last two o rings went. Use vasoline to hold them in place. Note I had to remove the oil filter housing to slide off the crank damper. One of the pipes was in the way. So buy the figure 8 gasket to re install. This is the only gasket not in the kit. See my pictures and write up which I posted. 52 hours all in. However I had some rework because I had to find where those two o rings went. Best John
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Wfmurphy49 (01-31-2019)
#5
w myrphy
hi there. Did you complete the chain gang replacement? Mine was sussessful. Note I used Christopher’s foreign car imports aj v8 full kit replacement. He is on eBay. It is a full replacement kit. Chris was great to talk with and helped me with a few technical points. Chris formerly had a Jag shop. Don’t forget to install the dime sized o rings on the vvt cam holders. They go between the holder and the block. Mine had fallen off when removing the holders and I did not know where the last two o rings went. Use vasoline to hold them in place. Note I had to remove the oil filter housing to slide off the crank damper. One of the pipes was in the way. So buy the figure 8 gasket to re install. This is the only gasket not in the kit. See my pictures and write up which I posted. 52 hours all in. However I had some rework because I had to find where those two o rings went. Best John
hi there. Did you complete the chain gang replacement? Mine was sussessful. Note I used Christopher’s foreign car imports aj v8 full kit replacement. He is on eBay. It is a full replacement kit. Chris was great to talk with and helped me with a few technical points. Chris formerly had a Jag shop. Don’t forget to install the dime sized o rings on the vvt cam holders. They go between the holder and the block. Mine had fallen off when removing the holders and I did not know where the last two o rings went. Use vasoline to hold them in place. Note I had to remove the oil filter housing to slide off the crank damper. One of the pipes was in the way. So buy the figure 8 gasket to re install. This is the only gasket not in the kit. See my pictures and write up which I posted. 52 hours all in. However I had some rework because I had to find where those two o rings went. Best John
#6
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Wfmurphy49 (01-31-2019)
#7
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Wfmurphy49 (02-01-2019)
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Wfmurphy49 (02-02-2019)
#11
thanks again for your suggestions
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