Question about 1986 Jaguar XJSC

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My 1984 Jaguar XJS HE is hard to start when the engine is cold. It works fine at normal operating temperature. There are no cold start injectors on this motor as per the service manual, so what could I check or how does the cold start work on this engine? I have already checked the ignition, fuel pump and filter, and the fuel regulators, but it hasn't rectified the problem.

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Pore a bottle of fuel injector cleaner in it and see if that solves your problem

Posted on Jul 27, 2009

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1984 Jaguar XJS HE, will drive fine for a while then stalls out at speed and usually take between 5-15 min and then will start again and run fine until the next time. I have checked the ECU, fuel AMP, the...


Where the fuel pump inlet sucks gas from the fuel tank, there is usually a little mesh bag protecting the pump from sucking in particles from the fuel tank. You may want to check and make sure it hasn't come loose or has a hole in it allowing you fuel pump to **** in dirt. When your pump is off, the suction goes away allowing the dirt to go back into the tank. When it's on, it'll **** the dirt back up causing loss of fuel.

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You may not have all the things I list. these are things that will make an engine run rich. ECM, 02 sensors, map sensor, mass air flow sensor, vacuum leaks, throttle position sensor, Clogged air filter, Clogged catalitic converter. You have already replaced the injectors and the ECT , so that rules them out. Check for codes. Start with vacuum leaks. Hoses and the intake manifold gaskets. If you need more info let me know. Randy

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1 Answer

2.0d x-type 2005 Est. Starting problems when engine is warm


Ok, time for car school. The vehicle is operated by the computer, every electrical concept that is. When the engine is cold, it starts fine because the computer has placed it in "cold start mode", putting more fuel into the engine than normally would until Once the engine is warmed up, a temperature sending unit or temp sensor tells the computer to change to normal run mode. IF said temp sensor is faulty and is not telling the computer to make said change, it stays in cold start mode, still dumping excess fuel in the engine that is now not required, cause it's warmed up. Like keeping the choke closed on older vehicles. Now I think you can answer your own question, when this no start action is happening after warm up and it always starts fine when cold, what's the first thing you check ? Right, the unsuspected temp sensor. Change that and no more start problem. Have a wonderful day. Glad I could be of service.

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1990 Deville 4.5 litre v-8 vacuum present from vacuum line to egr selenoid but no vacuum from egr selenoid to egr valve the car runs fine when cold but runs poorly when warmed to operating temperature.


You will not see any vacuum from the egr solenoid until the engine has reached normal operating temperature and certain other driving conditions have been reached (like throttle position and road speed). If the engine runs rough when warmed up, check the CTS (coolant Temp sensor) when hot and cold and if no fault shows there, start checking input sensors for engine and cam position, engine timing, RPM etc. If the EGR valve was leaking, it is only adding air to the exhaust stream and usually, manually opening the valve and blowing out the seat with compressed air should fix the issue. This can also be an issue with clogged injectors. When the engine is cold, fuel enrichment supplies more then normal fuel amounts to encourage even running. When the engine warms up (normal operating temperature), fuel enrichment mode is turned off. If your injectors are clogged (even if only slightly) fuel starvation will cause rough running. Fuel enrichment overcomes the starvation of clogged injectors. Try adding a propriety injector cleaner to your fuel tank and watch for an improvement. If you do see an improvement, have your injectors cleaned and tested professionally. If you locate any other issues with engine sensors, replace them and ensure the new components are adjusted correctly if required..

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2 Answers

Won't start. Runs terrible. changed plugs,wires,fuel pump,coil. plugs smelled of gas and were blackened.


Not terribly familliar with honda cars but most systems use either a cold start injector or just richen up mixture through the normal fuel system. This is controlled by a temperature sensor, either separate from or part of dash gauge sensor. I'd begin looking for that. If its always in "cold start" if will give you symptoms like yours. If not fuel injected, check choke operation. This may not be a "cure" but it's a good place to begin looking!

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1 Answer

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i had the same problem with my fiero the ignition module quits when it gets hot.

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Obviously, fuel and oil should never be in the same spot at the same time. You have a dead cylinder and maybe a stuck-open injector. The black smoke is from a too-rich fuel mix, so the cheap things to look for are in the fuel injection system. Look at the fuel pressure regulator as well. Good luck, and don't forget to relieve the fuel pressure before you do any work on fuel inj. engines!

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