So I did the basic tune up the other day 86 GT 2.8 Auto I changed Oil & Filter, Plugs (recommended nothing fancy like E3s), Wires, Cap, Rotor, PVC valve. So after all that the plugs that were next to the firewall in front looked real bad but got them out. The plugs close to the trunk took them out by hand no tools needed. ( they were also a different brand). Car initially didn't do anything just cranked over no fire. Fiddled with Cap and wires still same, finally fired, so took for quick spin, it hesitated on start up but then ran fine. Ran rough at stop lights. Got home let it sit for a bit. Went to pull in garage then it wouldn't stay running when put in gear. finally got it in garage. Tonight go out to fire it up and nothing just cranks with no firing. Checked the plugs and wires and cap again all looked good. Put all back together nothing. HELP I am lost. Could it be the Coil? Some Sensor? I am new to Fieros but can turn a wrench and troubleshoot things just at a loss as to what it could be should I put one item each back in minus the plugs to see if it fixes it?
Did you replace the plug wires one at a time or all at once? If all at once you might have mixed up the firing order. Double check that each wire is going to the corresponding plug.
Did you replace the plug wires one at a time or all at once? If all at once you might have mixed up the firing order. Double check that each wire is going to the corresponding plug.
I used masking tape labeled each wire to where it was at and then took sharpie and numbered the position on the cap as to what was where. So firing order is correct or I would assume I wouldn't have been able to drive yesterday for short spin. Just baffling.
Q1 - Key on but don't crank it. Does the fuel pump come on for two seconds and then turn off? It should.
Q2 - Key on engine not running. Does the check engine light come on? It should.
If you fail at both Q1 and Q2 check the ECM reset connector by the battery to make sure it is still plugged together.
Q3 - During cranking does the tach rise to about 200 RPM and then fall back to zero after cranking? It should.
Yes to all questions Fuel pump comes on and shuts off (use to motorcycle turning key and letting system pressurize before starting) Check engine light comes one. Tach does bounce with starter turning over pretty sure it was 200ish
Did you unplug any sensors while working on the engine? Maybe the MAP sensor got unplugged? Throttle Position Sensor? (Sounds like an unplugged MAF sensor but these cars don't use one so I would look to make sure everything is plugged in)
Tomorrow I will shoot starter fluid in and see what it does. Nothing else got unplugged matter of fact I went through all vacuum lines and plugs and made sure they were all good and secure. The only plug that really isn't there is the Temp Sending sensor near the ignition coil. But made sure it was all clean will fix it later. (Temp gauge on dash doesn't work needle fell off and laying at bottom of gauge. I will look at ICM connections and such tomorrow also. Anything particular to look for?
When you check the ICM take a good look at the connector. They tend to corrode over time and cause a bad connection.
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Originally posted by gr85z:
Tomorrow I will shoot starter fluid in and see what it does. Nothing else got unplugged matter of fact I went through all vacuum lines and plugs and made sure they were all good and secure. The only plug that really isn't there is the Temp Sending sensor near the ignition coil. But made sure it was all clean will fix it later. (Temp gauge on dash doesn't work needle fell off and laying at bottom of gauge. I will look at ICM connections and such tomorrow also. Anything particular to look for?
OK here is the latest, Shot starter fluid in nothing Neighbor came over (pretty good hobby mechanic) he recommended taking ICM out and having tested at parts store, took out and tested it FAILED - bought new on while there. So now I have New ICM, plugs, wires, cap ,rotor Still doing same thing motor turns, fuel pump makes noise (and plugs are wet with gas), but not firing off. Does anything need to be reset with ECM? I have new coil just haven't installed yet. I do have test light to put between plug and wire and will flash for each "spark" tested on the back 3 plugs since I can see and easy to get to. So something else I was thinking and neighbor mentioned also is the firing order Correct in the Chiltons for a 2.8?
I getting at a loss of things to try or look at I know it isn't to tough but was running good before I did change out just wasted fresh in there since cap and rotor were at end.
I just came up from garage the new coil I ordered showed up so figured what the heck give it a shot. So new coil in everything crossed and BINGO it fired up and runs like a champ. Crab the kiddo (since momma was out with other kiddo) went for quick drive sounds and runs great. Thanks everyone for the great feedback on things, now on to the next item.
How hard is it to fix temp gauge? (needle fell inside the gauge) I am sure there will be more might make a list and post on another topic.