2005 Hyundai Tucson 2.7L - Random acceleration issues and hesitation - Lemmy.World
This thing has been driving us nuts! We’re slowly but systematically replacing
basically every relevant part suggested by the various codes it’s thrown over
the past few years, but it still acts up, totally randomly. So far, we’ve
replaced all the plugs, plug wires, coil packs, fuel pump, and crankshaft
position sensor. I also briefly replaced the throttle position sensor, to which
I didn’t notice any difference either, but my roommate (the owner) thought that
seemed to somehow make it worse so he had me put the old one back in. We do
still have the new one though, and after what it did yesterday, I might put the
new one back in soon. More on what it did yesterday a little later. Still on the
menu of other parts to check/replace are the mass airflow sensor, oxygen sensor,
EGR valve, and camshaft position sensor (this model does have that sensor
right?) Anyways, what it did yesterday threw us both for a loop. While parked at
the gas station and idling, he pressed the accelerator pedal, and literally
nothing happened, engine RPM didn’t change a single bit, even when he put the
pedal to the floor it simply stayed at idle. I wondered what the hell the
computer was even thinking at that moment, like did the ECM just totally glitch
out then or what? So I had him shut it down, wait about 20 seconds or so, and
crank it back up. And sure enough it started responding to the accelerator
again, as it has been for the past few years anyways. I’m sure that it’s at
least partly related to the emissions control system, as the exhaust definitely
smells like it’s not burning all the gas (note that there’s thankfully no
visible emissions, just a notable odor), but why the hell would there be a
random one-off where the vehicle wouldn’t even respond to the accelerator at all
until shutting it down and restarting it? We’d go ahead and jump all in and
replace all the other parts I mentioned, but ya know … $$$ … so we’re tackling
things as he can afford them and as we narrow down and correct obvious issues
such as a few cracked vacuum lines that I’ve already replaced now. Anyways, if
you’ve read this far, thanks for your attention to this issue. If anyone has any
suggestions or advice to help us find the issue and save our sanity, we’re all
ears! And thanks in advance. Also, a bonus link for fellow mechanics:
https://charm.li/ [https://charm.li/] Operation CHARM - The Collection of
High-quality Auto Repair Manuals spans many makes and models from 1982 through
2013