 Rough idle - smooths out when I drive (going insane) |
 Mar 1, 2011 - 7:02 PM
|
 
|
|
Enthusiast Joined Feb 8, '08 From NJ Currently Offline Reputation: 0 (0%)  |
I have never found a problem with an engine that I was unable to fix with some moderate thinking.. but with this 1.8L engine I have done the following:
Symptoms: Car starts VERY FAST. Click vroom. Perfect. Idles 1200 or so to warm up, then drops to what appears to be factory setting around 750 or so. In park, or neutral the engine is vibrating but you don't feel it as bad. The moment you put it in a gear, R or D the entire car shakes to pieces. Touch the gas, and with a load the problem is magically gone until the next stop light... it never stalls. I just failed emissions for HC.. (unburned fuel... which made me think ignition system) - plugs - cap - rotor - wires - coolant temp sensor - egr check - re-ground everything - iac clean / check - vacuum sensor check - replace all vacuum lines - checked for leaks anywhere - set base timing to factory specs - changed fluids - changed motor mounts - unplugged and plugged back in every sensor to no avail - put on an entirely different distributor - drained the gas tank and put in all new fuel .. The only thing I can think of that I did not try is replacing the ignition coil in the distributor, it could be bad.. but the likely hood of both the old and newer distributors coils both being bad is probably slim... I'm going insane. Now after messing with the TPS my idle wont go below 1,000 or so.. guess I put it back in the wrong position. Oh well, I'll figure that out later but is there anything I'm missing here? I've tried everything I searched google many times I can't even find anything else to check. fuel pressure? Any ideas.... This post has been edited by 97Supra: Mar 1, 2011 - 7:05 PM |
 |
Replies
|
Sep 28, 2011 - 7:59 PM
|
|
 Enthusiast  Joined Mar 22, '07 From Houston, TX Currently Offline Reputation: 4 (100%) |
on the rear of the throttle body theres a small plate thats mounted/shaped similar to the TPS.
loosen it and rotate it. it will adjust the minimum opening angle of the idle control valve -------------------- QUOTE "And, as always, your friendship, help, and dedication to the advancement of Texas Celica dominance is GREATLY appreciated. Thanks bro." -DEATH 1994 GT: V6 swap, 5speed E53 W/ LSD, All Power, now RED 1995 ST: SOLD @273k miles, Auto, all power, CarPC, White 1994 ST: Totaled, 5spd, all power, Red RIP 07/09/09 @ 241,810 1994 Lexus LS400: This is my new DD |
|
Sep 28, 2011 - 8:19 PM
|
|
 Enthusiast Joined Mar 27, '04 Currently Offline Reputation: 14 (100%) |
QUOTE (stephen_lee @ Sep 28, 2011 - 8:59 PM)  on the rear of the throttle body theres a small plate thats mounted/shaped similar to the TPS. loosen it and rotate it. it will adjust the minimum opening angle of the idle control valve thanks! i found that and adjusted it so now it idle's around 1000... so hopefully if it tries jumping down low on RPMs, it will still have plenty of RPMs left.. however it is still running a little rough.. like i have a miss-fire.. so not sure if its still a vacuum leak.. or spark plug.. spark plug wire... etc... not sure what how to test next... -------------------- ~Daniel~ No Longer Celica Owner.. moved on to a 03 WRX-EJ207
 |
Posts in this topic
97Supra Rough idle - smooths out when I drive (going insane) Mar 1, 2011 - 7:02 PM
Smaay hhmmm got me stumped, messing with your TPS is bad... Mar 1, 2011 - 7:08 PM 97Supra yes, all mounts changed. Gotta find the route caus... Mar 1, 2011 - 7:18 PM 97Supra installed an entirely different rail / fpr / injec... Mar 3, 2011 - 3:30 PM RavenAegis45 Did you check your alternators output it may be ol... Mar 3, 2011 - 4:07 PM d3ath2009 my brother's civic had basically the same prob... Mar 3, 2011 - 4:20 PM 97Supra alternator is brand new 14-15+v running
just inst... Mar 3, 2011 - 6:12 PM 97Supra I installed the new ERG today and that was a waste... Mar 7, 2011 - 6:56 PM cyberblader1130 Any exhaust leaks? O2 sensors good? Have you che... Mar 7, 2011 - 7:29 PM 97Supra New header / had to have a shop cut it at the fle... Mar 7, 2011 - 7:53 PM
cyberblader1130 QUOTE (97Supra @ Mar 7, 2011 - 8:53 ... Mar 7, 2011 - 8:20 PM 97Supra well, this one is from a 95 geo prism, we pulled t... Mar 7, 2011 - 8:27 PM cyberblader1130 QUOTE (97Supra @ Mar 7, 2011 - 9:27 ... Mar 7, 2011 - 9:04 PM captb I had a similar problem but mine would die out som... Mar 8, 2011 - 1:00 PM SwissFerdi I think I might have to do mine as well gents, I n... Mar 8, 2011 - 1:55 PM 97Supra did the fuel filter when we pulled the motor..
Ju... Mar 8, 2011 - 2:37 PM SwissFerdi ^ Without seeing the bill, I can agree with you th... Mar 8, 2011 - 2:43 PM cyberblader1130 Fuel Pump? Mar 8, 2011 - 3:26 PM Tigawoods going through the same problem. everything i do do... Mar 8, 2011 - 3:37 PM 97Supra The fuel pressure was to spec according to the hay... Mar 9, 2011 - 8:49 AM stephen_lee if youre really worried about the internal conditi... Mar 9, 2011 - 7:39 PM 97Supra Compression test results:
Cylinder 1: 205 Cylinde... Mar 10, 2011 - 9:20 AM stephen_lee motor should be okay then. raise the idle and it s... Mar 10, 2011 - 12:46 PM 97Supra I'm definitely going to try this for the comfo... Mar 10, 2011 - 5:19 PM windowlicker do a cylinder leak down test. Mar 16, 2011 - 12:11 AM stephen_lee how'd this turn out? Mar 16, 2011 - 8:29 AM 97Supra got the car back, it passed inspection and the sho... Mar 16, 2011 - 7:37 PM clownpRon I tried to solve this mystery, but gave up after a... Mar 17, 2011 - 3:25 AM 97Supra If I figure it out I'll be sure to post it up ... Mar 17, 2011 - 8:15 AM brenton1919 QUOTE (97Supra @ Mar 17, 2011 - 9:15... Mar 27, 2011 - 3:03 PM clownpRon I'm pretty sure though it's the throttle b... Mar 18, 2011 - 12:10 AM stephen_lee raise the idle with that resistor guys. the idle i... Mar 20, 2011 - 1:16 PM Bitter you can't just change the throttle stop screw,... Mar 20, 2011 - 2:14 PM delusionz You haven't unwittingly used Polyurethane engi... Mar 21, 2011 - 4:08 PM zfjohnson07 my car shakes like hell as well, today for some od... Mar 27, 2011 - 6:14 PM stephen_lee if theres a bottom end problem (balance, rod) it w... Mar 28, 2011 - 3:39 PM 97Supra i still haven't found the issue.. but that shi... Apr 4, 2011 - 10:57 AM zfjohnson07 well not to jack your thread. been searching for i... Apr 5, 2011 - 7:50 PM 97Supra The hard idle set screw is what the throttle pulle... Apr 7, 2011 - 3:55 PM bluecelica1 QUOTE (97Supra @ Apr 7, 2011 - 4:55 ... Nov 14, 2011 - 9:20 PM csscza Im following along mine just got back on the road ... Apr 19, 2011 - 2:23 PM brenton1919 QUOTE (csscza @ Apr 19, 2011 - 3:23 ... Apr 19, 2011 - 8:59 PM Jaws4God having a similar issue.. haven't really done m... Sep 28, 2011 - 12:46 PM stephen_lee QUOTE (Jaws4God @ Sep 28, 2011 - 8:1... Sep 28, 2011 - 9:09 PM Special_Edy pull all four spark plugs(keep them in order) and ... Nov 18, 2011 - 9:16 PM |
13 User(s) are reading this topic (13 Guests and 0 Anonymous Users)
0 Members:
| Lo-Fi Version | Time is now: November 25th, 2024 - 4:37 AM |