xj6 iii 4.2 1981 engine running problem
#1
xj6 iii 4.2 1981 engine running problem
Hello,
I am new to this forum and I greet you guys
A friend of mine bought an 1981 XJ6 iii 4.2L Jag (on ebay,from the US) and after getting the car we found the engine has some problem running (igninte and stop, rough idle, hard to accelerate, hard to raise revs etc..)
the problem sort of come and go so its hard to describe..
- We replaced all 6 injectors to new ones.
- We checked the air flow meter and it seems ok (reading the output voltage)
- We found the Air flow meter's input voltage is about 10.2V on its harnes.
I would appreciate any help or hint with this
Regards,
G
I am new to this forum and I greet you guys
A friend of mine bought an 1981 XJ6 iii 4.2L Jag (on ebay,from the US) and after getting the car we found the engine has some problem running (igninte and stop, rough idle, hard to accelerate, hard to raise revs etc..)
the problem sort of come and go so its hard to describe..
- We replaced all 6 injectors to new ones.
- We checked the air flow meter and it seems ok (reading the output voltage)
- We found the Air flow meter's input voltage is about 10.2V on its harnes.
I would appreciate any help or hint with this
Regards,
G
#2
#3
#6
#7
Possible.
More commonly the contaminated fuel A) doesn't ignite very well and B) damages the fuel pump.
The fuel system needs a thorough cleaning, fresh fuel, another new filter, and possibly a new fuel pump.
One option is to remove the tanks (big job, by the way) and have them professionally cleaned. Or remove them and attempt do-it-yourself cleaning. Or leave them in place and attempt do-it-yourself cleaning. Many owners go the DIY route with good sucess.
It's advisable to install a fuel filter between each tank and the pump....thus protecting the pump from any contamination that may be remaining. I know one fellow who used this method to let the system clean itself, so to speak. The first pair of filters clogged in just a couple days. The second pair clogged in about a week. The third pair took about a month to clog. He went through 6 or 7 replacements before all the loose contamination was finally captured. Not saying this method would work in all cases, mind you.
Cheers
DD
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#8
Doug thank you for your detailed answers.
I am thinking of "bypassing" the system to eliminate other causes of trouble by mounting new external fuel tank + filter and a replacement pump and check it.
what do you think? will a replacement pump do the job? (should output 2.5-3 bars if I am correct)
thx
I am thinking of "bypassing" the system to eliminate other causes of trouble by mounting new external fuel tank + filter and a replacement pump and check it.
what do you think? will a replacement pump do the job? (should output 2.5-3 bars if I am correct)
thx
#10
#11
The only spec from Jaguar is 36.25psi while cranking.....I'll let you do the metric conversion :-)
I'm guessing a 2-3 psi variance from that depending on vacuum, open throttle vs closed throttle
Cheers
DD
#12
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