1987 Gt, Weird Problem.

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1987 Gt, Weird Problem. - 5/11/2008 6:41:18 PM    Riceinator Posts: 146 Joined: 8/15/2007 Status: offline hi guys. My car is still sd, so i think this is the most appropriate place to post my question. When I first start the car up, it idles nice and seems to drive with full power. But after driving for a bit and getting up to operating temperature, everything gets all weird. When idling, it idles rough and kind of feels like a miss. Also, when giving it anymore than light gas, it seems to surge (kinda feels like bucking) at anything more than 2k rpm. When I watch the tach, you can see the rpms bouncing around. It only does this when it is warm. Sometimes it does it worse than others. This problem has me frustrated and confused. Any input is welcome. oh yea, and so far, i have replaced plugs, wires, fuel filter and tfi blaster coil. And yes, i gapped the plugs correctly. Thanks in advance. edit: it also feels like it lacks power once it is warmed up. < Message edited by Riceinator -- 5/11/2008 7:14:25 PM > _____________________________ 1987 T-Top GT. Bone Stock...for now. Post #: 1

RE: 1987 Gt, Weird Problem. - 5/12/2008 3:11:38 PM    stangbanger87 Posts: 619 Joined: 12/5/2007 Status: offline possibly in the o2 sensors or in the egr from what it sounds like to me . _____________________________ 1987 gt under construction. SD and proud ! (in reply to Riceinator) Post #: 2

RE: 1987 Gt, Weird Problem. - 5/12/2008 7:40:35 PM    Riceinator Posts: 146 Joined: 8/15/2007 Status: offline ok, how would i go about testing the o2's and the egr? _____________________________ 1987 T-Top GT. Bone Stock...for now. (in reply to stangbanger87) Post #: 3

RE: 1987 Gt, Weird Problem. - 5/14/2008 2:00:22 PM    Vertastang Posts: 414 Joined: 3/21/2005 Status: offline mine did that somtimes to does it run fine on like Cool days and act up on hotter days??? mine did almost the same issue your saying and it was the temp control sensor changed that and the issue went away. _____________________________ (in reply to Riceinator) Post #: 4

RE: 1987 Gt, Weird Problem. - 5/17/2008 7:27:20 PM    jayh88gt   Posts: 30 Joined: 5/15/2008 Status: offline check for vacuum leaks. make sure vacuum line to map sensor isnt dryrotted otherwise, how are the wires, cap, and rotor? sounds like its loaded up and the plugs are fouled but u gotta figure out why what happens if you repeatedly beat the snot out of it does it clear up? (in reply to Vertastang) Post #: 5

RE: 1987 Gt, Weird Problem. - 5/17/2008 8:43:06 PM    67mustang302   Posts: 5421 Joined: 4/21/2007 Status: online Check the ECT, EGT, EGR, pull codes etc. _____________________________ Who cares how much horsepower it has, all that matters is how fast it goes! Best run 13.23 at 106.97mph with a 2.183 60' Times from before tune and driver mod. (in reply to jayh88gt) Post #: 6

RE: 1987 Gt, Weird Problem. - 5/18/2008 8:57:53 PM    jayh88gt   Posts: 30 Joined: 5/15/2008 Status: offline oops i see new wires now id bet vacuum, but double check timing and fuel pressure (in reply to 67mustang302) Post #: 7

RE: 1987 Gt, Weird Problem. - 5/20/2008 7:15:22 PM    Riceinator Posts: 146 Joined: 8/15/2007 Status: offline thanks for the input guys, but I believe I have it tracked down to the ignition module getting hot and acting weird. The part comes in tomorow, should be on by tomorow night. If it doesnt fix it, I will come back and ask again. Thanks again guys. _____________________________ 1987 T-Top GT. Bone Stock...for now. (in reply to jayh88gt) Post #: 8

RE: 1987 Gt, Weird Problem. - 5/25/2008 12:58:37 AM    jeffp2152   Posts: 5 Joined: 5/8/2008 Status: offline did that fix it? ignition module? I am having a very similar problem with mine. i put new plugs in after getting it back together and once i start it up it runs good.. but then after it runs for a little bit it runs like crap, bucks, and the plugs have a bunch of soot on them. i checked the fuel pressure, did cap, rotor, wires... whats left? 02 sensor, egr(it has egr deleted and has for a long time), ignition components, fuel injectors? (in reply to Riceinator) Post #: 9

RE: 1987 Gt, Weird Problem. - 6/15/2008 3:44:22 PM    Riceinator Posts: 146 Joined: 8/15/2007 Status: offline the ignition module did not fix it. I am still stumped here. I havent  had the chance to pull codes yet though. _____________________________ 1987 T-Top GT. Bone Stock...for now. (in reply to jeffp2152) Post #: 10

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