Zerocygnal
20+ Year Contributor
- 641
- 1
- Jul 1, 2002
-
Springfield,
Ohio
It never ends...
Okay..if I start the engine it stays in the 1500RPM range at idle (Doesn't surge) and just misses like you wouldn't believe. Once at operating temperature it idles 800RPM to 400RPM almost stalling and missing every time. Knocks a little, not too bad when you rev the engine.
All readings on the Pocketlogger look normal except the ISC will sometimes bottom out to 0 steps to keep the engine running. (again normal for under the stalling condition, it's trying to keep the engine running)
I cannot get a proper vacumn reading because the engine is missing. it stays about 14inHG with this problem. Before it was at 17 to 18inHG, and 22 to 23inHG at full clutch downshift.
-I have done the following to attempt to resolve the issue-
-Inspected and cleaned tips of relatively new NGK plug wires
-Installed BPR7ES @28gap (Old plugs had a white tint to them/lean condition didn't look too bad)
-Replaced O2 Sensor (did this to resolve a prior problem, it wasn't responding on the pocketlogger it now works.)
-Performed injector disable and engine balance test. Every injector was at 2.3 Pulse Width@ 5% Duty Cycle and reacted normally.
-Found a black wire w/ yellow (probably white) stripe disconnected from the plug that goes into the alternator? ( I wasn't sure what it was for, but I saw the plug it had separated from. I replaced the entire wire because of heat damage, shrinktubed, heatsheilded the harness and reconnected it.)
-Tested ISC coils all between 28 and 30ohms
-Replaced BISS Screw and O-ring (Again, this was done for a prior problem and the engine was operating properly with it afterwards.
-Removed TB Elbow and cleaned the hell out of the TB and TB Plate (it is now polished aluminum).
-Checked all wiring connections and inspected harness integrity.
-Replace Fuel Filter on 11/02/02
-Cleaned Air Filter
-Changed Oil...(at this point I was at my wits end..)
I DID NOT...
-Check Fuel Pressure
-Check for Fuel Contaminants
-Test the MAF (The Karman was reacting normally with the pocketlogger and showed 95 Barometer I assumed it was working and within spec.)
Bad Ignition, Bad Fuel? What?
Any ideas? 10 years of Automotive experience and I'm stumped. Pathetic...
Okay..if I start the engine it stays in the 1500RPM range at idle (Doesn't surge) and just misses like you wouldn't believe. Once at operating temperature it idles 800RPM to 400RPM almost stalling and missing every time. Knocks a little, not too bad when you rev the engine.
All readings on the Pocketlogger look normal except the ISC will sometimes bottom out to 0 steps to keep the engine running. (again normal for under the stalling condition, it's trying to keep the engine running)
I cannot get a proper vacumn reading because the engine is missing. it stays about 14inHG with this problem. Before it was at 17 to 18inHG, and 22 to 23inHG at full clutch downshift.
-I have done the following to attempt to resolve the issue-
-Inspected and cleaned tips of relatively new NGK plug wires
-Installed BPR7ES @28gap (Old plugs had a white tint to them/lean condition didn't look too bad)
-Replaced O2 Sensor (did this to resolve a prior problem, it wasn't responding on the pocketlogger it now works.)
-Performed injector disable and engine balance test. Every injector was at 2.3 Pulse Width@ 5% Duty Cycle and reacted normally.
-Found a black wire w/ yellow (probably white) stripe disconnected from the plug that goes into the alternator? ( I wasn't sure what it was for, but I saw the plug it had separated from. I replaced the entire wire because of heat damage, shrinktubed, heatsheilded the harness and reconnected it.)
-Tested ISC coils all between 28 and 30ohms
-Replaced BISS Screw and O-ring (Again, this was done for a prior problem and the engine was operating properly with it afterwards.
-Removed TB Elbow and cleaned the hell out of the TB and TB Plate (it is now polished aluminum).
-Checked all wiring connections and inspected harness integrity.
-Replace Fuel Filter on 11/02/02
-Cleaned Air Filter
-Changed Oil...(at this point I was at my wits end..)
I DID NOT...
-Check Fuel Pressure
-Check for Fuel Contaminants
-Test the MAF (The Karman was reacting normally with the pocketlogger and showed 95 Barometer I assumed it was working and within spec.)
Bad Ignition, Bad Fuel? What?
Any ideas? 10 years of Automotive experience and I'm stumped. Pathetic...