Question about 1998 Lincoln Town Car

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Motor idling rough ,leaking coolant around value cover area and themorstat.

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It is likely a cracked intake manifold. This is a common problem.

Posted on Nov 11, 2010

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Posted on Jan 02, 2017

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https://www.bellperformance.com/blog/rough-running-engine
Apr 21, 2015 - When diagnosing an engine with a rough idle, there are certain things that must be ... If the problem does not reoccur, the codes will be erased by the computer. ... when accelerating the vehicle, which causes a higher fuel demand. .... it was water in gas...added added Gas LineAntifreeze/Water Remover.

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My 02 galant runs rough when put in gear but in idle runs okay it also surges up and down replaced the plug wires


Okay, lets start with the oil you found on spark plugs when you were replacing them. this oil is coming from the valve cover tube hole area, notice the plugs go into the holes in the valve cover, there is a gasket the goes around the top of the tubes and when it leaks it goes into spark plug hole, the valve cover needs replacing .
this will cause rough idle and running problems, after replacing valve cover gasket the holes must be cleaned, using crab cleaner, spray into holes and use air to blow out . this may need to be done a few times to get oil out .
after oil is removed . then remove spark plugs and wipe them clean.
The next step is to find the air (vacuum leak) , you said you hear it around intake tube. check for cracks or broken vacuum line. this leak will cause idle problems and driving problems,

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1 Answer

2004 ford 6cly rough idle must keep giving gas


V6? does it get any better when it warms up? Does RPM rev hi to low or does it sit at one speed and shakes? Hows the plugs? first thing first, buy a can of carb/choke cleaner $ 5.00 . Remove any plastic motor cover plates that would expose the motor. Spray cleaner around the base of the intake manifold and all mating areas of the intake manifold. ( not into the air intake) does the motor rpm change or rev up? if yes, you have bad intake gasket. also spray and check all air (vacuum) hose connections for proper fit and no cracks. Check plugs and note color and condition of each and what cylinder it was from, a brown paper bag color is normal, a super clean look is lean possible coolant leak, a burnt or melted electrode is early detonation timing, oil carbon deposit bad rings or valve guides,seals, wet is to rich , air fuel mix. Several things cause this, check all seals,air lines first,air filter, cracked or split intake tube, gasket check, does it run rough at cold idle only ( possible temp sensor ) you can check alot of things to eliminate without spending cash,

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1 Answer

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i would think a plugged fuel injector on # 6 cylinder could be the problem,or a big vacuum leak at that cylinder
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i would check #6 cyl. spark plug after driveing around a while if it looks new, ie no deposits on it then an injector would be what i would change next

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High idle on 89 4runner v6 EFI. Problem started after a leak in the cooling system causing it to loose pressure and get hot. After fixing the leak and changing out the thermostat the issue remains. It's...


Make sure the coolant temp. sensor is connected.

Bad coolant temp. sensor?

Coolant temp. sensor is ground out on the engine block?

========
The ECU use the resistor value from the coolant temp. senor to determine the block temp.

If the value is out of range.....the ECU will "think" the motor is still cold and let it ran at high idle.

I will use a carburetor cleaner to clean out the throttle plate and intake.




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1986 Nissan 200Sx Turbo idles rough and drives rough. timeing rechecked 3 times and we just put a new rotor and Distributor cap on and it runs a little smoother. i have checked the Compression and it was...


How white? I would get a can of carbcleaner and spray a little here and there around the intake area to see if you have a vacuum leak. If the smoke is real white like the clouds the you may have an internal coolant leak to a cyl.

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98 Lincoln TC,Cold starts fine ,runs good until warm, then shuts off. No codes,Cranks ok, have spark, PATS ok. No fuel pressure, cant hear fuel pump prime,New Fuel relay. jumped fuel pump - works. I do not hear fuel pump prime up, do not have fuel gauge, but pressing on valve in fuel rail- no pressurized fuel. Fuel regulator seems ok, not leaking / vacuum line dry as a bone. If I let it set for 15 min , it will start up again, but for a few minutes then dies out. If I let it set overnight it starts up perfectly and runs until operating temp is reached then stalls/stumbles, and shuts down. Vacuum is good while cranking, even with no start, Checked Inertia switch in trunk, it is not tripped. I have seen Ford TSB summaries' that mention issues like this , but I am not able to see to description. A point to add, the MAF sensor was cleaned, then I decided to replace it and did not make a difference. I do not have any stored codes, and the PATS is working fine, typical 2 second flash from and once key is inserted a 3 second steady light, then disappears. I have seen the TSB mentioning C103 Connector, it looks fine, I swapped out fuel pump relay with ac relay, still no difference.mention of wires around battery, do not know where to start. in dash service engine light and odometer is normal, seen other posts the say they only have lines, but mine is ok. the start of all of this , I washed engine with regular garden hose, ( not using pressure washer).also in the mean time, rear window defroster stopped working as well, can not say for same reason, but a mention.My problem started after washing engine. this is one of four Panther platform vehicles I owned with exact 4.6l w code engine, which I rinced down before. The only sensor I can think of is Oil pressure , or a corroded wire

Feb 27, 2017 | 1998 Lincoln Town Car

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