 |
 | Home | Contact Us | FAQ | Search & Site Map | Link to Us |
 | Sign In | Join | Other 45 Sites in Network |
Car Forum / Honda Cars / May 2007Civic hesitation problem...
Buddy of mine just rebuilt (with all OEM parts!) a D16A6 with PGM-FI for his '89 Civic (including the appropriate computer and wiring harness). Got it installed, turned the key, engine turned 3 times... and fired right up. Very nice. Idles smoooooth and quiet... But when he gives it any gas, even just sitting in neutral, it bogs and hesitates. Hit the gas too fast, and it just sputters and dies. Do it carefully, and once it gets 1800rpm or so, it works fine. It also seems to idle a little bit rich. Thoughts? Ideas? He's checked for error codes, but it's not giving any. TIA > Buddy of mine just rebuilt (with all OEM parts!) a D16A6 with PGM-FI for > his '89 Civic (including the appropriate computer and wiring harness). [quoted text clipped - 9 lines] > > TIA BTW, it looks real nice, he's done a lot of work cleaning up the body, detailing the interior, and cleaned and repainted all the engine parts. http://www2.moltenimage.com/civic/ > Buddy of mine just rebuilt (with all OEM parts!) a D16A6 with PGM-FI for > his '89 Civic (including the appropriate computer and wiring harness). [quoted text clipped - 9 lines] > > TIA Does he have enough fuel pressure to run the fuel injection? That takes more pressure than a carbureted engine,and the fuel pump may be different for a carbureted model.  SignatureJim Yanik jyanik at kua.net >> Buddy of mine just rebuilt (with all OEM parts!) a D16A6 with PGM-FI for >> his '89 Civic (including the appropriate computer and wiring harness). [quoted text clipped - 13 lines] > That takes more pressure than a carbureted engine,and the fuel pump may be > different for a carbureted model. The old engine was a D15, if memory serves, but it definitely had PGM-FI. It runs great past 2000rpm and on up to redline, it's just that initial low-RPM push that's dropping out. >>> Buddy of mine just rebuilt (with all OEM parts!) a D16A6 with PGM-FI >>> for his '89 Civic (including the appropriate computer and wiring [quoted text clipped - 18 lines] > PGM-FI. It runs great past 2000rpm and on up to redline, it's just > that initial low-RPM push that's dropping out. maybe a bad throttle position sensor? Maybe it's defective at the low end,perhaps a dirty/worn resistive element. SignatureJim Yanik jyanik at kua.net it sounds like you converted from DPFI to MPFI, in which case a bit of wiring was involved simple run down to check your wiring against ECU pin component a1 inj 1 a3 inj 2 a5 inj 3 a7 inj 4 a15 inj resistor box run all red/blk wires from injectors back to resistor box swap pins from c1 and c2 to b10 and b12 respectively run new wire from c1 and c2 into engine bay swap out old DPFI distributor plug to MPFI plug (matching colors) wire from c1 goes to blue/grn wire on new distributor plug wire from c2 goes to yell/grn wire on new distributor plug extend TPS plug 6" and swap outer 2 wires sounds like you forgot to switch the TPS wires > it sounds like you converted from DPFI to MPFI, in which case a bit > of wiring was involved [quoted text clipped - 17 lines] > > sounds like you forgot to switch the TPS wires Both engines (the one that came out of the car, and the new one) have the same intake systems, the "PGM-FI PROGRAMMED FUEL INJECTION" throttle bodies and multipoint injectors. I'll tell him to double-check the wiring, but I don't think that'll be it. >> it sounds like you converted from DPFI to MPFI, in which case a bit >> of wiring was involved [quoted text clipped - 22 lines] > bodies and multipoint injectors. I'll tell him to double-check the > wiring, but I don't think that'll be it. it's likely that it is - the tps sensor rotation is opposite on the 2pfi to the 4pfi. the plug and sensors are the same but the wires are reversed as a result. >>> it sounds like you converted from DPFI to MPFI, in which case a bit >>> of wiring was involved [quoted text clipped - 26 lines] > to the 4pfi. the plug and sensors are the same but the wires are > reversed as a result. Except that both the previous engine and the new engine are both MPFI with identical throttle bodies... >>>> it sounds like you converted from DPFI to MPFI, in which case a bit >>>> of wiring was involved [quoted text clipped - 29 lines] > Except that both the previous engine and the new engine are both MPFI > with identical throttle bodies... then check the cam timing. > it sounds like you converted from DPFI to MPFI, in which case a bit > of wiring was involved [quoted text clipped - 17 lines] > > sounds like you forgot to switch the TPS wires good thinking. if not, check the cam timing. >>>> Buddy of mine just rebuilt (with all OEM parts!) a D16A6 with PGM-FI >>>> for his '89 Civic (including the appropriate computer and wiring [quoted text clipped - 19 lines] > maybe a bad throttle position sensor? > Maybe it's defective at the low end,perhaps a dirty/worn resistive element. I thought of that... we haven't had a chance to check it yet, but I'll pass that on the suggestion. But wouldn't the computer be throwing error codes in that case? Fortunately he still has the old engine, complete with intake, so there's at least a known working one there :) >>>>> Buddy of mine just rebuilt (with all OEM parts!) a D16A6 with PGM-FI >>>>> for his '89 Civic (including the appropriate computer and wiring [quoted text clipped - 22 lines] > pass that on the suggestion. But wouldn't the computer be throwing > error codes in that case? it may only throw codes if there's a bad connection - like if the slider's worn on the carbon track inside the sensor. reverse wiring won't be a bad connection. > Fortunately he still has the old engine, complete with intake, so > there's at least a known working one there :) > Buddy of mine just rebuilt (with all OEM parts!) a D16A6 with PGM-FI for > his '89 Civic (including the appropriate computer and wiring harness). Got [quoted text clipped - 9 lines] > > TIA Just a thought...Some of these systems take a bit of time for the various processors to synch and get a baseline established. I don't know about the Honda Civic but I do know that the Chrysler takes a day or so to get completely normal. DaveD >> Buddy of mine just rebuilt (with all OEM parts!) a D16A6 with PGM-FI for >> his '89 Civic (including the appropriate computer and wiring harness). Got [quoted text clipped - 13 lines] > Honda Civic but I do know that the Chrysler takes a day or so to get > completely normal. Yeah, don't think that's an issue in an '89 with OBD-0. > Buddy of mine just rebuilt (with all OEM parts!) a D16A6 with PGM-FI for > his '89 Civic (including the appropriate computer and wiring harness). Got [quoted text clipped - 9 lines] > > TIA It would really help to separate mixture trouble from ignition trouble. How about a timing light to see what the timing does when the throttle is opened a bit? The timing should advance a few degrees, but not jump fifteen degrees or retard a lot. (It may retard some based on the rise in MAP.) Similarly he can try adding a squirt of starting fluid into the air cleaner a second before he opens the throttle to see if that improves the response - which would point to a lean mixture on throttle opening. Mike >> Buddy of mine just rebuilt (with all OEM parts!) a D16A6 with PGM-FI for >> his '89 Civic (including the appropriate computer and wiring harness). Got [quoted text clipped - 17 lines] > before he opens the throttle to see if that improves the response - which > would point to a lean mixture on throttle opening. Ignition timing has already been checked, but I'll pass on the other suggestion. |
Reply to this Message |
 Sign In
 Join
 My Latest Posts My Monitored Threads My Blog My Photo Gallery My Profile My Homepage Start New Thread Enable EMail Alerts Rate this Thread
|
©2009 Advenet LLC Privacy Policy - Terms of Use
This website includes both content owned or controlled by Advenet as well as content owned or controlled by third parties.