My '89 XJ runs like poo when it's on the first start of the day. No matter if it's hot outside or cold, it runs like crap. Here's a detailed explanation:
When I start it, it takes a normal cranking time for a RENIX, maybe a tad longer, that's not the issue. Once running, it'll idle consistantly, but any touch to the throttle leaves a slightly big hesitation before the engine takes off. When I let the clutch out and give it some gas, the engine bogs down and bucks quite a bit before it gets above ~1500 RPM give or take. It will always stall at the first stop sign. Always, unless I warm it up a bit.
I just replaced the intake/exhaust manifold gasket (exhaust was cracked, so I welded that up) and it did the exact same thing before, and after. Only thing is now it starts up a little easier. I noticed that when I floor it (say going up a hill) my defrosts turn on even with the selector on OFF. I've already made my vacuum system as simple as can be.. Could it be a bad vacuum bottle?
TPS was replaced and is at about .82 volts. IAC was replaced and is all cleaned/oiled up.
What are things to look for? Vacuum leak? CTS? Fuel injectors?
Also another thing I noticed is that when I first started it up after replacing the exhaust gasket, I accidently left off the MAP vacuum line, and it would idle really rough like it was cammed. However, every time I went to restart it, it would start up instantly, like a 91+ XJ. It would also have amazing throttle response, absolutely no hesitation. But once I hooked the MAP back up, it was the same old story. Long crank time (normal) and shitty throttle response.
I replaced the MAP with a JY one and it has the same issue.. So either that's not the issue, or both are bad. I don't know, I'm kinda torn between trying to figure it out, and just living with a grumpy cold hating motor. Like it's owner :spin1:
When I start it, it takes a normal cranking time for a RENIX, maybe a tad longer, that's not the issue. Once running, it'll idle consistantly, but any touch to the throttle leaves a slightly big hesitation before the engine takes off. When I let the clutch out and give it some gas, the engine bogs down and bucks quite a bit before it gets above ~1500 RPM give or take. It will always stall at the first stop sign. Always, unless I warm it up a bit.
I just replaced the intake/exhaust manifold gasket (exhaust was cracked, so I welded that up) and it did the exact same thing before, and after. Only thing is now it starts up a little easier. I noticed that when I floor it (say going up a hill) my defrosts turn on even with the selector on OFF. I've already made my vacuum system as simple as can be.. Could it be a bad vacuum bottle?
TPS was replaced and is at about .82 volts. IAC was replaced and is all cleaned/oiled up.
What are things to look for? Vacuum leak? CTS? Fuel injectors?
Also another thing I noticed is that when I first started it up after replacing the exhaust gasket, I accidently left off the MAP vacuum line, and it would idle really rough like it was cammed. However, every time I went to restart it, it would start up instantly, like a 91+ XJ. It would also have amazing throttle response, absolutely no hesitation. But once I hooked the MAP back up, it was the same old story. Long crank time (normal) and shitty throttle response.
I replaced the MAP with a JY one and it has the same issue.. So either that's not the issue, or both are bad. I don't know, I'm kinda torn between trying to figure it out, and just living with a grumpy cold hating motor. Like it's owner :spin1:
