Hey everyone what would cause cold starting problems as in like 20°F and the car will start but misses like crazy and will even make the check engine light start to flash if I let it run long enough. But is I start it and rev it to about 1500 it will run smooth until I let off then back to missing again. However if I hold it at 1500 or so until it starts to warm up a little bit it will run perfectly fine. No codes except for random misfire codes but that’s being set because it’s missing like crazy during cold start up. Warmer days say 30° and above its perfectly fine

 

Tony, it is sounding like you have some gum build up on the throttle body. You may need to pull off the intake to the throttle body, spray some throttlebody cleaner in there. If you see brown, spray it away. I would also say to spray some on a rag and wipe the edges of the butterfly (the silver disk in the center). This may flood the car. Do not worry. Simply depress the gas pedal all the way to the floor, hold it there, then attempt to start the car. This will shut off the fuel injectors, let the flooding condition clear. You can then lift your foot and let the car catch. Probably need to roll the engine for 3-4 seconds and then start easing off the gas pedal.

 

Possible intermittent vacuum leak that seals itself when it warms up? Plugs or coils? Intake gaskets leaking? How long have you had a check engine light on?

Just what codes are you getting? Maybe clear the codes you see and then post what is coming back.

 

I will give that a try Thermo and the car once I changed a o2 sensor months ago has never had the check engine light back on again. Except for the cold mornings when it misses like crazy then after I get it to warm up a little I can shut it off and start it back up and the light goes right out. Also when I say after it warms up a little I mean when the temp gauge barely even moves from cold. I can switch it off and start it up and it’ll be perfectly fine.

 

I have the every cylinder miss fire codes and the one code that just says random. If I start the car and it acts stupid I can hook up the code reader and all of those will show current. If I hold the rpm at 1500 to let it warm up a little bit and then shut it off and restart the light goes out car runs fine and all the miss fire codes so as history. Also the fuel pressure is 55-56 psi during the whole time. I got the car over the summer so I haven’t had this problem but now it’s winter time and over night lows are 20° or a little below and this problem has surfaced.

The previous owner had the oil changed not long before I got the car does anyone think that maybe he has used a higher weight oil that when it’s getting that cold at night that the oil isn’t allowing the variable valve timing to work properly?? It’s about due a oil change now anyways

 

I highly doubt it would be the oil. 20 degrees isn't even that cold, plus the oil might not even be that cold when you start it up depending on how long it has sat since you last drove it. Real easy to check out Thermo's idea and see where you are and go from there.

 

https://www.jaguarforums.com/forum/x...d-start-10619/

https://www.jaguarforums.com/forum/x...t-fixed-72726/

SEARCH is a marvelous tool

 

It’s supposed to be back up in the 40°’s for the next week so I’ll run thru all the suggestions and see what I come up with. Also thanks dell for the links and I did use search and found those before posting but looked over the vacuum leak idea because I wouldn’t have though a 10° difference in outside temperature would cause something like this to happen when at all other times there is absolutely no issues with how the car runs but still I’ll give it all a check. I’ll post back with my findings

 

That small difference CAN make a difference in the tight tolerance IMT seals. Also note there was a possible fuel injection cleaning solution.

 

Just a update on what I’ve done to hopefully correct the problem. Hasn’t been cold enough since working on it to see if the problem is fixed

cleaned throttle body and replaced gaskets

replaced IMT seals. Already had green seals and replaced with oem NOS seals ( also green )

replaced all intake manifold seals upper and lower

replaced spark plugs and all coils were dry ( no oil ) in tubes

replaced fuel filter and air filter

replaced pcv valve

Car currently still doesn’t have the check engine light on which is always nice and also has the P1111 systems passed code stored. Seems to run a little bit smoother but not much to where it’s really noticeable. So for now I’ll keep my fingers crossed until temps drop and I can see if it’s fixed or not

 

Well, if you haven't solved the original issue you have at least done a lot of good preventative maintenance.

 

"Global Warming Effect" - the weather is right at the edge of any of us really needing "real" gasoline, the stuff that will work when it gets really cold out.
I don't think we will get any "decent" cold weather gasoline at all this year, but I think you have two or three work-arounds that should suffice:

1) Buy your S.O. a nice warm fuzzy, stylish coat, boots and hat "just to wear in the Jag" so she can sit in the car and keep it well revved up for the 15 minutes or so until it is warmed up and the problem has gone away;
2) Sit out there yourself until you've warmed it up;
3) or purchase and install a 1200 watt in-hose heater, plug it in and just leave it on overnight (or put it on a timer). When you get into the car, there will likely be warm air already coming out of the heater and defroster before you even start the car.

 

Hey TonyJ1977 . I have this same car & also the same problem with my 2003 jag X-type 3.0 engine..what was the fix for the cold temp starts of about 32 degrees?

 

So far I haven’t found a fix. But it is getting annoying tho. A work around is that I have found is I start the car and I rev it up to about 1500 to 1800 rpm for about 15-20 seconds then it will idle and warm up normally. If I just reach in and start the car and not touch the gas it will start but will miss like crazy. I’m in the middle of buying another 02 3.0 for a parts car as it hit a deer and I’m getting it for next to nothing so I will start replacing parts one after the other until I find what the problem is then maybe it’ll give ppl a better idea of where the main problem could be.

 

Hey Tonyj1978, I found the Fix..the part you need to change is the Temperature sensor..that will fix the Cold start Engine missing / rough start upon being colder weather..ok Good Luck on your Fix..Happy Jaguar Driving!!

 

Which temperature sensor would you be talking about ? The one for the gauge always seems to work right as it should. The one that shows the outside temperature sometimes has way off readings but I never pay attention to it as I figured it only was for well the outside temp.

 

I spent the past two days doing tests on different sensors and I have finally found it’s fault. The CRANK POSITION SENSOR !! I removed the CKP and started by doing a ohm check. Warm it’s reading was 366 ohms but when I laid it out in the snow for a few hours it dropped all the way down to 276 ohms ( I’m not sure what new or known good is supposed to be ) but I removed the one from my second cat ( parts car ) and installed it and this morning it was 13°F and the kitty cat fired right up and done just like it’s supposed too. No more coughing up fur ***** !!!!!