PT Cruiser Forum

PT Cruiser Forum (http://www.ptcruiserlinks.com/forum/)
-   General Turbo Discussions (http://www.ptcruiserlinks.com/forum/general-turbo-discussions/)
-   -   Rough Idle! (http://www.ptcruiserlinks.com/forum/general-turbo-discussions/67051-rough-idle.html)

rockandroller 20 Oct 2019 10:37 pm

Rough Idle!
 
Hmmm...

car was running fine, but when I took it in for oil change last week I had them put on new plugs and wires. Plugs were the 'new-style' iridium kind.

Drove it couple hundred miles on highway and it seemed fine. Did get a P0304 (misfire) code during the trip, but that reset OK. First ever misfire code, on this car...

Now ( past few days) I notice that it is running rough at idle. ( never noticed that before). I'm wondering it it could be due to the plugs?? Maybe I should go back to Champion copper??

Also, out on the highway last evening it threw a couple of new codes; one for power-steering sensor, and the other for oil pressure sensor. I have been getting 'spurious' oil pressure lightings for months now, on and off... often right after a car wash, so I suspect wiring harness issues. However, never an actual CODE for oil pressure sensor before! So maybe it's time to change out that oil pressure sensor ( and have the wiring looked at??)
P0522 Engine Oil Pressure Sensor/Switch Circuit Low Voltage
P0551 Power Steering Pressure Sensor Circuit Range/Performance

I reset, and haven't seen the codes since. (Drove around quite a bit today) Idle still does feel a little rough!

Just wondering if I should have them change out the plugs at the same time... what's the general sentiment on "plugs-vs-rough-idle??

chuzz 21 Oct 2019 07:52 am

Re: Rough Idle!
 
Lots of arguments have developed over the whole spark plug recommendations and issues. Mopar has used Champion plugs for years. Every Mopar I ever owned up until about 2010 came with Champions. That's what I recommend using. OEM style plugs. I don't follow the trends and just stick to what I know works best. I ran my GT on Champions gapped at .042. As for the OPS and power steering, I don't know. I would go ahead and change both if they're throwing codes. But first, I'd check the wiring to both.

Grasshopper77 21 Oct 2019 10:56 am

Re: Rough Idle!
 
If they didn't replace the intake gaskets, I'd suspect an intake leak for the rough idle.

Fk5 21 Oct 2019 11:23 am

Re: Rough Idle!
 
Quote:

Originally Posted by Grasshopper77 (Post 708506)
If they didn't replace the intake gaskets, I'd suspect an intake leak for the rough idle.

That was my first thought, which I was why I liked this post. I do not actually "like" intake gasket leaks. I thought this was an NA, but see now that I am in the turbo forum. The aluminium manifold turbos are notorious for blowing the gasket at #4. Check the manifold is torqued correctly.

Since you just had work done, the most likely culprits are the plenum gasket, plug wire, or plug. Check everything is seated correctly. On mine it turned out to be the lower gasket (intake to head) being blown out and blocking the injector port. That happened to at least one other poster - but it isn't likely here since the problem showed up right after the plug change and they probably removed the upper gasket for that.

rockandroller 21 Oct 2019 01:09 pm

Re: Rough Idle!
 
Thanks for the hints! :)

All this talk of gaskets seems odd, though... I have changed the plugs on this once myself (PIA, it was) and there was no need to remove the intake. Just extracted the plugs and replaced them (with help of some fuel line tubing, to get them back in place...) Do you think my mechanic would likely go to the trouble of pulling the intake manifold??

Fk5 21 Oct 2019 01:49 pm

Re: Rough Idle!
 
Quote:

Originally Posted by rockandroller (Post 708508)
Thanks for the hints! :)

All this talk of gaskets seems odd, though... I have changed the plugs on this once myself (PIA, it was) and there was no need to remove the intake. Just extracted the plugs and replaced them (with help of some fuel line tubing, to get them back in place...) Do you think my mechanic would likely go to the trouble of pulling the intake manifold??

I think "the book" calls for it.

_PTGT03 21 Oct 2019 08:35 pm

Re: Rough Idle!
 
just install the oem style champion plugs for best results

ptcruisersteve 22 Oct 2019 08:12 am

Re: Rough Idle!
 
Keep posting the diagnostics codes. Usually you get clues from the codes.

rockandroller 18 Jun 2020 11:23 pm

Re: Rough Idle!
 
Hmmm. no codes, and the whole engine has practically been rebuilt :) but still the rough idle. Mechanic is perplexed, it 100% does not have any vacuum leaks - got new PCV, new manifold gasket, manifold has been "smoked" to check it...

And he seriously doubts it is a plug/wires issue, even though it only showed up after the plugs and wires were done (at my request, when it probably didn't need it!) at the last oil change

I wonder what is the "idle control valve"? ( was reading about it in some other idle threads...)

for context , last week it got a thorough going over for a few days:

Complete front brakes (rotors, pads, calipers, etc)
Timing Belt/water pump/ tensioner
Cam and crank seals
all three motor mounts
Radiator
rad hoses
power steering hoses
starter
crank sensor
some sensor wiring and connectors
some ground wires
pcv valve
intake and valve cover gaskets
misc shop supplies...

(but the rough idle persists)

Macgyverman1123 19 Jun 2020 12:03 am

Re: Rough Idle!
 
Pssst: Change your trans mount too. That, plus the other three will make your car feel brand new, take it from me ;)


All times are GMT -5. The time now is 09:57 am.

Powered by vBulletin® Version 3.8.2
Copyright ©2000 - 2020, Jelsoft Enterprises Ltd.
LinkBacks Enabled by vBSEO 3.6.0 PL2 © 2011, Crawlability, Inc.
vB.Sponsors


1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243