MailmanDan
NAXJA Forum User
- Location
- Riverside, Iowa
I have a 1998 XJ 4.0 (factory right hand drive from Scotland). It's temp gauge is in Celsius so it reads 40 at far left(cold), 100 at center, 125 at far right (hot).
It typically runs at or just below 100, which is 212f (boiling point of water).
On a warm to hot day it will sometimes go over 100c by maybe a few degrees and when that happens, I get instant rough idle and hesitation until the temp gets back to 100c. This occurs mostly when I stop to deliver my mail and shut off the engine for a few minutes, then upon restart the engine temp has risen to just over 100 and runs rough. This is more frequent when I use the 10% Ethanol mix gas (here in Iowa it is 30 cents a gallon cheaper). I have read about the problem in the fuel injectors (2 and/or 3) which get over heated and the gas vaporizes, causing rough running till vapor is cleared, and I think that is likely the culprit. When I turn off the engine, the electric fan does NOT stay on to cool and prevent "heat soak".
Recently, for a day or 2, the electric fan came on and ran after I shut it off, reducing or preventing the heat soak. I realized that for as long as I remember, the fan has NOT been running after shut down, even though it runs when engine is on.
SO MY QUESTION IS, what is the controller for the fan running after shut off? I would like to fix or replace whatever is preventing it from doing what it was made to do. This would seem to be some relay or sensor or other electronic control. How can I test the possible culprits?
I am going to replace the injectors with the neon injectors, add heat shielding and replace the exhaust manifold as it has a crack.
Thanks!
It typically runs at or just below 100, which is 212f (boiling point of water).
On a warm to hot day it will sometimes go over 100c by maybe a few degrees and when that happens, I get instant rough idle and hesitation until the temp gets back to 100c. This occurs mostly when I stop to deliver my mail and shut off the engine for a few minutes, then upon restart the engine temp has risen to just over 100 and runs rough. This is more frequent when I use the 10% Ethanol mix gas (here in Iowa it is 30 cents a gallon cheaper). I have read about the problem in the fuel injectors (2 and/or 3) which get over heated and the gas vaporizes, causing rough running till vapor is cleared, and I think that is likely the culprit. When I turn off the engine, the electric fan does NOT stay on to cool and prevent "heat soak".
Recently, for a day or 2, the electric fan came on and ran after I shut it off, reducing or preventing the heat soak. I realized that for as long as I remember, the fan has NOT been running after shut down, even though it runs when engine is on.
SO MY QUESTION IS, what is the controller for the fan running after shut off? I would like to fix or replace whatever is preventing it from doing what it was made to do. This would seem to be some relay or sensor or other electronic control. How can I test the possible culprits?
I am going to replace the injectors with the neon injectors, add heat shielding and replace the exhaust manifold as it has a crack.
Thanks!
