 Rough idle - smooths out when I drive (going insane) |
 Mar 1, 2011 - 7:02 PM
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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 |
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Mar 7, 2011 - 7:53 PM
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Enthusiast Joined Feb 8, '08 From NJ Currently Offline Reputation: 0 (0%) |
New header / had to have a shop cut it at the flex and make it fit the car, ebay sent me the wrong one.. haha 02 sensors are new/er and a new catalytic converter was just installed about a month ago at meineke.
I'm gonna take your advice and order a new pigtail plug for the alternator since wiggling it makes the car die.. obviously the plug is screwed, but the low voltage output from the alt.. I will go get a new alt. tomorrow morning and install it. if it helps I will be very glad.. this cars been through a lot! |
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Mar 7, 2011 - 8:20 PM
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Enthusiast  Joined Oct 24, '09 From Appleton, Wisconsin 54915 Currently Offline Reputation: 7 (100%) |
QUOTE (97Supra @ Mar 7, 2011 - 8:53 PM)  New header / had to have a shop cut it at the flex and make it fit the car, ebay sent me the wrong one.. haha 02 sensors are new/er and a new catalytic converter was just installed about a month ago at meineke. Yeah... You'll have that with the ebay header's. Wasn't the wrong one, they're all like that. No where near a perfect fit. I'm gonna take your advice and order a new pigtail plug for the alternator since wiggling it makes the car die.. obviously the plug is screwed, but the low voltage output from the alt.. I will go get a new alt. tomorrow morning and install it. if it helps I will be very glad.. this cars been through a lot! It seems like the only issue is that little bit of wiring. Don't get a new Alt. until after you change that wiring. No use in spending more money unless you are absolutely sure it's the Alt. Or if you would just prefer a new one. :-P |
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 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 on the rear of the throttle body theres a small pl... Sep 28, 2011 - 7:59 PM Jaws4God QUOTE (stephen_lee @ Sep 28, 2011 - 8... Sep 28, 2011 - 8:19 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 |
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