horrible fuel economy.
#141
#142
I'm not familiar with the IAC reset but beside that , probably needs some miles and cycles for the ECU to find itself before spending money on a shop
And a good Italian tune up as you have been idling around in the driveway with an out of tune regulation ( rich mixture )
And a good Italian tune up as you have been idling around in the driveway with an out of tune regulation ( rich mixture )
Last edited by Parker 7; 10-02-2022 at 11:12 PM.
#143
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Parker 7 (10-02-2022)
#144
The more i think about it, the more a bad tps makes sense.
so adjustment might be needed.
if my torque reading is accurate and it is reading 10.59 at idle when it should be reading 12.5 that means the car thinks the throttle is too low and compensates by opening the IACV to increase the airflow.
But if the throttle is physically at the right spot this results in increased airflow and therefore high idle
so adjustment might be needed.
if my torque reading is accurate and it is reading 10.59 at idle when it should be reading 12.5 that means the car thinks the throttle is too low and compensates by opening the IACV to increase the airflow.
But if the throttle is physically at the right spot this results in increased airflow and therefore high idle
#145
12.9% is the lowest it goes for the XJS. The x300 may be different. You may want to read through the forums, or look in a service manual. I don't want to lead you down the wrong path.
The TPS can be adjusted manually. You'd have to remove the throttle body, probably widen the screw holes on the TPS, reattach with the screws just firm enough that you can rotate the TPS with a little hand force. Then with the car on, and the engine running, rotate the TPS until idle RPMs is where its supposed to be at and lock down the screws. You'll be doing this in the blind, since the TPS will be upside down in a somewhat restricted area.
The TPS can be adjusted manually. You'd have to remove the throttle body, probably widen the screw holes on the TPS, reattach with the screws just firm enough that you can rotate the TPS with a little hand force. Then with the car on, and the engine running, rotate the TPS until idle RPMs is where its supposed to be at and lock down the screws. You'll be doing this in the blind, since the TPS will be upside down in a somewhat restricted area.
#146
I wouldn't touch the TPS adjustment just yet and lose what you have., There is based one resent example where the idle TPS reading is learned by the ECU and is fine if off from the paper factory value ( 0.60 + or - 0.02 volts DC )
You can see if there is a bad spot on the TPS which would put the ECU in and out of optimal mode operation which can drive troubleshooting logic nuts
You can see if there is a bad spot on the TPS which would put the ECU in and out of optimal mode operation which can drive troubleshooting logic nuts
Last edited by Parker 7; 10-03-2022 at 06:28 PM.
#147
#148
When you get the car back, I would get a multimeter and record the voltage at idle from the TPS so you know what value the ECU will now use as a baseline. It might become helpful if you have throttle issues in the future.
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Parker 7 (10-04-2022)
#149
#150
ok. so i tested again and got proper reading,
it seems that it is reading too low of voltage.
throttle closed it is reading .53v
it then moves and climbs nicely reaching full 5.01v at WOT.
so for the most part it is noce. but it is reading the throttle as more closed than it should be and obviously opening the iacv too much
it seems that it is reading too low of voltage.
throttle closed it is reading .53v
it then moves and climbs nicely reaching full 5.01v at WOT.
so for the most part it is noce. but it is reading the throttle as more closed than it should be and obviously opening the iacv too much
#151
ok. so i tested again and got proper reading,
it seems that it is reading too low of voltage.
throttle closed it is reading .53v
it then moves and climbs nicely reaching full 5.01v at WOT.
so for the most part it is noce. but it is reading the throttle as more closed than it should be and obviously opening the iacv too much
it seems that it is reading too low of voltage.
throttle closed it is reading .53v
it then moves and climbs nicely reaching full 5.01v at WOT.
so for the most part it is noce. but it is reading the throttle as more closed than it should be and obviously opening the iacv too much
when you relearn the adapt position no more problems. i think old jaguar australia/cambo is near you
Last edited by xalty; 10-06-2022 at 07:10 AM.
#152
it all depends on where the closed base idle was learned. if a new tps was ever installed it would probably be close to .6V, these ecms have trouble learning the idle voltage if it drops down from the original adaptation position, up doesn’t seem to be an issue.
when you relearn the adapt position no more problems
when you relearn the adapt position no more problems
I have rang one Tony Arditto who is a jag specialist not too far from me, i am hoping that he can get my car in next week to do the front crank seal, but he is really busy and may not be able to.
not sure if he has the tool or not, will find out when the car is there.
and then I rang Dr Jag who from what I have heard is one of the best around and speaking to him he seems to really know his stuff, but he has a 2 month waiting list. so i will book the old girl in for a check with him but it is going to be a while.
had not known about Old Jaguar, will check em out.
#153
trouble is just getting it anywhere anytime soon.
I have rang one Tony Arditto who is a jag specialist not too far from me, i am hoping that he can get my car in next week to do the front crank seal, but he is really busy and may not be able to.
not sure if he has the tool or not, will find out when the car is there.
and then I rang Dr Jag who from what I have heard is one of the best around and speaking to him he seems to really know his stuff, but he has a 2 month waiting list. so i will book the old girl in for a check with him but it is going to be a while.
had not known about Old Jaguar, will check em out.
I have rang one Tony Arditto who is a jag specialist not too far from me, i am hoping that he can get my car in next week to do the front crank seal, but he is really busy and may not be able to.
not sure if he has the tool or not, will find out when the car is there.
and then I rang Dr Jag who from what I have heard is one of the best around and speaking to him he seems to really know his stuff, but he has a 2 month waiting list. so i will book the old girl in for a check with him but it is going to be a while.
had not known about Old Jaguar, will check em out.
#154
just checked his website. seems great.
saw he has listed as a project working on reveres engineering for AJ16 engine tunes.
by the looks of some of the work he does, he will probably be a fan of my LED headlight upgrade and Android Head unit install.
saw he has listed as a project working on reveres engineering for AJ16 engine tunes.
by the looks of some of the work he does, he will probably be a fan of my LED headlight upgrade and Android Head unit install.
#155
Tried to do that reset thingy on the iacv and got no change.
maybe the iacv is cooked.
anyone had any luck with chinese parts?
loreada look a proper company. So thats a good sign
Loreada
worth a try?
Jlm1285
it is LOREADA LRD-153
same as this
Lrd-153
maybe the iacv is cooked.
anyone had any luck with chinese parts?
loreada look a proper company. So thats a good sign
Loreada
worth a try?
Jlm1285
it is LOREADA LRD-153
same as this
Lrd-153
Last edited by Spud Maat; 10-10-2022 at 09:52 PM.
#156
#157
i decided to order one of the above, got it for $40 AU incl shipping... just gotta wait for it to come from china now.
#158
I am planning a 2nd year clean of the Throttle body and intake components.
I just ordered a $12 dollar IACV on the Bay, seller is eccppautoparts. The pintle looks correct and it comes with a years warranty (for whatever that's worth).
What could go wrong?
I just ordered a $12 dollar IACV on the Bay, seller is eccppautoparts. The pintle looks correct and it comes with a years warranty (for whatever that's worth).
What could go wrong?
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Spud Maat (10-12-2022)
#159
#160