BulletMaker
NAXJA Forum User
- Location
- Cascades, WA
So I knew this day would come sooner or later and just like the topic says my 1990 Renix Cherokee is now having this uncomfortable shudder, stumble and backfire issue whenever I try to put my foot into it.
Rather than asking for advice (Cruiser, I know what you're about to post, I already did that and I'm about to do it again RIGHT NOW! I would like to document my findings, as this is the third cherokee I've come across and I havn't seen a good writeup on this particular problem (yes I did google, and mostly it looks like it's probably a TPS problem). This is the third renix I've come across with this problem, the first one I was out in the desert on an off-road trip with some people I didn't know too well (owner had it towed out), second was a jeep I was thinking about buying for the wife (decided to pass), and now my jeep.
Signs and symptoms:
Over the last few weeks I've been noticing a greater incidence of "pinging" aka pre-detonation. I was considering that perhaps the knock sensor was bad.
Now, Tonight I was heading over to the shop, I put gas in it, started it up and tried to accelerate... no bueno, not happening.
Also, it's had an issue stalling randomly shortly after it's first start-up for the day.
Another thing that is probably unrelated, but could be, I've always gotten a persistent wine from my fuel pump depending on a number of things, I think this probably just means my ballast resistor is crap, but we shall see!
What I'm going to check:
Fuel pressure - I did a basic test, engine running in park, pulled the vacuum line to the regulator still stumbled on accel.
Fuel lines - I put a new fuel filter in about 3 months ago, but I will check and make sure I don't have a busted line that's letting air in/gas out.
IAT - I'm sure it probably needs cleaning at least.
IAC - I cleaned this out some months ago, worth a check
Throttle body - should be clean, will verify when I put a new TPS on it
TPS - I think this is where my problem lies, and I happen to have a spare so we shall see.
O2 Sensor - I have the one I took off a few years ago before my last smog check, I will check it with the MM and see if it's good enough to put back in. if the TPS doesn't solve the problem.
Photos Coming soon!
Rather than asking for advice (Cruiser, I know what you're about to post, I already did that and I'm about to do it again RIGHT NOW! I would like to document my findings, as this is the third cherokee I've come across and I havn't seen a good writeup on this particular problem (yes I did google, and mostly it looks like it's probably a TPS problem). This is the third renix I've come across with this problem, the first one I was out in the desert on an off-road trip with some people I didn't know too well (owner had it towed out), second was a jeep I was thinking about buying for the wife (decided to pass), and now my jeep.
Signs and symptoms:
Over the last few weeks I've been noticing a greater incidence of "pinging" aka pre-detonation. I was considering that perhaps the knock sensor was bad.
Now, Tonight I was heading over to the shop, I put gas in it, started it up and tried to accelerate... no bueno, not happening.
Also, it's had an issue stalling randomly shortly after it's first start-up for the day.
Another thing that is probably unrelated, but could be, I've always gotten a persistent wine from my fuel pump depending on a number of things, I think this probably just means my ballast resistor is crap, but we shall see!
What I'm going to check:
Fuel pressure - I did a basic test, engine running in park, pulled the vacuum line to the regulator still stumbled on accel.
Fuel lines - I put a new fuel filter in about 3 months ago, but I will check and make sure I don't have a busted line that's letting air in/gas out.
IAT - I'm sure it probably needs cleaning at least.
IAC - I cleaned this out some months ago, worth a check
Throttle body - should be clean, will verify when I put a new TPS on it
TPS - I think this is where my problem lies, and I happen to have a spare so we shall see.
O2 Sensor - I have the one I took off a few years ago before my last smog check, I will check it with the MM and see if it's good enough to put back in. if the TPS doesn't solve the problem.
Photos Coming soon!