Some obscure issues here.
Cat Fuzz
01-29-2005, 07:28 PM
This has been bugging me for months now and I'd really just like to try and fix it.
94 Rodeo 4x4 3.2L. Engine hesitates just enough to really annoy me when I accelerate. Also, if I hold the pedal steady at just higher than idle, the engine will surge and slow at a regular interval. No CEL ever since I've owned it (few years).
I've recently replaced the spark plugs and wires, pcv valve, cleaned the throttle body, air filter is fine. Just got done replacing fuel filter.
I have a hard time accepting that this might be normal. So, if someone could really get their noodle reved up on this one and help me figure this out, I'd really appreciate it. :icon16:
EDIT: Also recently ran some Sea Foam through the fuel injectors.
94 Rodeo 4x4 3.2L. Engine hesitates just enough to really annoy me when I accelerate. Also, if I hold the pedal steady at just higher than idle, the engine will surge and slow at a regular interval. No CEL ever since I've owned it (few years).
I've recently replaced the spark plugs and wires, pcv valve, cleaned the throttle body, air filter is fine. Just got done replacing fuel filter.
I have a hard time accepting that this might be normal. So, if someone could really get their noodle reved up on this one and help me figure this out, I'd really appreciate it. :icon16:
EDIT: Also recently ran some Sea Foam through the fuel injectors.
amigo-2k
01-29-2005, 08:14 PM
how many miles? Was it your first time using a gas additive to clean the injectors?
-Ryan
-Ryan
Cat Fuzz
01-29-2005, 08:42 PM
124K
Never used fuel additives. I followed the directions on the can of Sea Foam and poured it directly into the throttle body while running.
Never used fuel additives. I followed the directions on the can of Sea Foam and poured it directly into the throttle body while running.
amigo-2k
01-29-2005, 09:10 PM
Unfortunatly that will not clean the injectors that way. You can add sea foam to the gas, but at 124k I think it could be a bit risky, since you may free up some crud in the tank.
Your best bet is to spend the cash and take it to a place that will hook your fuel rail up to a can of cleaner so you won't need to worry about adding stuff to your tank.
I had a truck that did the same as yours. I risked it and ran three tanks of gas with a fuel injector additive. The method where they hook a can of cleaner to the rail is the best way to go.
-Ryan
Your best bet is to spend the cash and take it to a place that will hook your fuel rail up to a can of cleaner so you won't need to worry about adding stuff to your tank.
I had a truck that did the same as yours. I risked it and ran three tanks of gas with a fuel injector additive. The method where they hook a can of cleaner to the rail is the best way to go.
-Ryan
Cat Fuzz
01-29-2005, 09:33 PM
So, you really think its just dirty injectors?
amigo-2k
01-29-2005, 11:16 PM
rereading over your post, I see you have replace all of the normal things to fix your problem (key ones, plugs, wires and fuel filter). The only other thing it could be is a vaccum leak somewhere (I'm not sure if you have a bunch of vaccum tubes).
-Ryan
-Ryan
explicit408
01-23-2007, 02:48 AM
Any updates on this? I think Im having the same issue when the engine is warm.
Ramblin Fever
01-23-2007, 06:50 AM
O2 sensor??
Cat Fuzz
01-24-2007, 11:41 AM
I never did figure out what the problem is. Still does it. Still annoys me. I have ruled out, tune-up items, MAP sensor, EGR valve, TPS. If I had a nice data monitoring scan tool, I could probably pinpoint the problem.
:banghead:
:banghead:
kb2nto
01-24-2007, 06:31 PM
I had a problem like yours. Replaced the throttle position sensor didn't help in my case. Turned out to be a loose connection on the fuel pump at the tank. Maybe this will help . I am told a bad throttle position sensor will cause this problem...Ed
Cat Fuzz
01-24-2007, 11:16 PM
TPS is good. Checked it with a volt meter.
2eyefishclaw
01-26-2007, 06:37 PM
I had a trooper that did this it annoyed the hell out of me. The really bad thing was no codes and I work on these things for a living, my wife would hound me for it every day. I finally decide one day after some deep thought to try cleaning the IAC valve did not help so I replaced it my stupid problem was finally gone
corning_d3
01-26-2007, 06:42 PM
I would guess either the fuel pump is getting weak or an O2 sensor is getting slow and lazy. Just my 2 cents..
trooperbc
01-26-2007, 08:09 PM
i've been following this thread and. . .i am going to repeat 2eyefishclaw's post above just so it doesn't get lost in the shuffle, with added emphasis. thanks 2eye for the answer !!! I had a trooper that did this it annoyed the hell out of me. The really bad thing was no codes and I work on these things for a living, my wife would hound me for it every day. I finally decide one day after some deep thought to try cleaning the IAC valve did not help so I replaced it my stupid problem was finally gone
//bc
//bc
Cat Fuzz
01-27-2007, 01:00 AM
Does the IAC valve do have an effect on anything off idle? I don't have an idle problem, its off idle, out of gear when it fluctuates. No fluctuation while driving.
It's been doing this since I bought it 5 years ago.
It's been doing this since I bought it 5 years ago.
95.5 Rodeo
01-27-2007, 01:30 PM
I had a similar problem on my Rodeo a few years ago. I personally cleaned the IAC then had the dealer replace that part later after an engine diagnosis. It made no difference in the surging at all.
Look here:
http://www.automotiveforums.com/vbulletin/showthread.php?t=258045
And here:
http://www.automotiveforums.com/vbulletin/showthread.php?t=258045&page=2
Don't get me wrong, I respect 2eye's opinions and the fact that replacing the IAC solved his problem, but it didn't solve mine.
I now believe that it's normal for the Rodeo engine to surge like clockwork when in neutral or park for our year range.
Oh, and the off idle hesitation is more noticable to me in the Winter and barely noticed in the Summer.
Good Luck,
Dale
Look here:
http://www.automotiveforums.com/vbulletin/showthread.php?t=258045
And here:
http://www.automotiveforums.com/vbulletin/showthread.php?t=258045&page=2
Don't get me wrong, I respect 2eye's opinions and the fact that replacing the IAC solved his problem, but it didn't solve mine.
I now believe that it's normal for the Rodeo engine to surge like clockwork when in neutral or park for our year range.
Oh, and the off idle hesitation is more noticable to me in the Winter and barely noticed in the Summer.
Good Luck,
Dale
trooperbc
01-27-2007, 02:18 PM
ok, i just read thru this thread *again* and thru your links 95.5 (thanks for those). am i getting this right? you all are concerned with a thing that only happens if you put the gear in N neutral and rev the engine to a steady 2000 rpm? ? ? first: why do you do this? second: why is this a problem?
(i actually think i may have the solution for you all, *but* i've got to narrow down what the complaint is. . .again, so bear with me . . .or humor me. . . .i just want to make sure i *get* it . . .
//bc
(i actually think i may have the solution for you all, *but* i've got to narrow down what the complaint is. . .again, so bear with me . . .or humor me. . . .i just want to make sure i *get* it . . .
//bc
Cat Fuzz
01-27-2007, 04:15 PM
ok, i just read thru this thread *again* and thru your links 95.5 (thanks for those). am i getting this right? you all are concerned with a thing that only happens if you put the gear in N neutral and rev the engine to a steady 2000 rpm? ? ? first: why do you do this? second: why is this a problem?
(i actually think i may have the solution for you all, *but* i've got to narrow down what the complaint is. . .again, so bear with me . . .or humor me. . . .i just want to make sure i *get* it . . .
//bc
I like things to work properly. There is no reason for an engines RPM's to fluctuate off-idle like that. I don't like it, I want to fix it. Same with the hesitation. It's annoying.
(i actually think i may have the solution for you all, *but* i've got to narrow down what the complaint is. . .again, so bear with me . . .or humor me. . . .i just want to make sure i *get* it . . .
//bc
I like things to work properly. There is no reason for an engines RPM's to fluctuate off-idle like that. I don't like it, I want to fix it. Same with the hesitation. It's annoying.
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