Starts, idles, bogs with gas / throttle
#1
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1989 XJS with marelli ignition.
Got it running (thanks forum!), now starts easily and idles smooth but bogs with gas.
new plugs, wires, rotor, cap, new gas, new fuel filter, fuel pressure is 35-37 psi,
TPS voltage is .30 it and 4.6 WOT.
What to check next?
Got it running (thanks forum!), now starts easily and idles smooth but bogs with gas.
new plugs, wires, rotor, cap, new gas, new fuel filter, fuel pressure is 35-37 psi,
TPS voltage is .30 it and 4.6 WOT.
What to check next?
#2
#4
#5
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I've got a 1990 XJS Coupe V12.
BACKGROUND:
Replaced the plug wires, rotor, cap, all vacuum hoses (even checked the little red on going to cabin), and replaced the temp sensor on the "B" side intake manifold. Also, checked gap on both throttle bodies and they are within spec, I haven't changed injector wires out, and I think it's running rich.
I have a Jag shop manual, parts manual, and Kirby Book, but no help.
QUESTION:
Here's the issue, when I fire it up I get a little bit of rough idle, and if I rev it with no load it runs just fine, the second I put it under load and give it gas, I get backfiring (sounds like at the "A" side manifold.)
I know my way around Jags (have a few) but this one is stumping me.
I would greatly appreciate feedback.
PS I've done all the simple things like clean the injectors, replaced the fuel, and the fuel lines in the rear of the trunk are all newer.
BACKGROUND:
Replaced the plug wires, rotor, cap, all vacuum hoses (even checked the little red on going to cabin), and replaced the temp sensor on the "B" side intake manifold. Also, checked gap on both throttle bodies and they are within spec, I haven't changed injector wires out, and I think it's running rich.
I have a Jag shop manual, parts manual, and Kirby Book, but no help.
QUESTION:
Here's the issue, when I fire it up I get a little bit of rough idle, and if I rev it with no load it runs just fine, the second I put it under load and give it gas, I get backfiring (sounds like at the "A" side manifold.)
I know my way around Jags (have a few) but this one is stumping me.
I would greatly appreciate feedback.
PS I've done all the simple things like clean the injectors, replaced the fuel, and the fuel lines in the rear of the trunk are all newer.
#6
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I've got a 1990 XJS Coupe V12. BACKGROUND: Replaced the plug wires, rotor, cap, all vacuum hoses (even checked the little red on going to cabin), and replaced the temp sensor on the "B" side intake manifold. Also, checked gap on both throttle bodies and they are within spec, I haven't changed injector wires out, and I think it's running rich. I have a Jag shop manual, parts manual, and Kirby Book, but no help. QUESTION: Here's the issue, when I fire it up I get a little bit of rough idle, and if I rev it with no load it runs just fine, the second I put it under load and give it gas, I get backfiring (sounds like at the "A" side manifold.) I know my way around Jags (have a few) but this one is stumping me. I would greatly appreciate feedback. PS I've done all the simple things like clean the injectors, replaced the fuel, and the fuel lines in the rear of the trunk are all newer.
#7
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I bumped it up for you to read. I was surprised that's what did the trick for mine but it's been running great ever since.
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Charlene n John
XJ6 & XJ12 Series I, II & III
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