SBpunk Posted August 12, 2015 Posted August 12, 2015 1992 HO 5speed longbox So something got messed up. Put in some new injectors, bored TB and a cowl intake today. Went to start up the comanche and it would barely start. Rough idle then dies shortly after. Throwing codes 24 and 65. Any ideas before I start back tracking everything I did today?
91Pioneer Posted August 12, 2015 Posted August 12, 2015 What injectors did you put in? First off check vacuum lines like the one going to the MAP thingy. Verify all electrical connections you touched and double check all vacuum lines.
SBpunk Posted August 12, 2015 Author Posted August 12, 2015 703s black. Guessing those are my issues. I double checked all the wires. The only vacuum hose that isn't connected is the one that runs into the backside of the airbox and connects to a hard plastic tube going around the back of the engine compartment. I'm going to swap the injectors back to stock and see if that solves my problem. I've never had good luck swapping injectors.
SBpunk Posted August 12, 2015 Author Posted August 12, 2015 Forgot to mention its backfiring at high RPM's when I rev the engine to keep it from shutting down on me.
Akula69 Posted August 12, 2015 Posted August 12, 2015 Vacuum leak somewhere....at intake manifold or TB would be my thought.
SBpunk Posted August 12, 2015 Author Posted August 12, 2015 Thanks Akula I'll check it out when I get off work. Until then I have 8 hours of annoying anticipation before I can go figure this crap out. I really don't want to pull the injectors again hahahaha
Akula69 Posted August 12, 2015 Posted August 12, 2015 If you can get a helper to hold the throttle open - a can of carb cleaner (judiciously) sprayed around while its running will pin point it immediately.
HOrnbrod Posted August 12, 2015 Posted August 12, 2015 When you swapped the TPS to the new throttle body, did you make sure the TB shaft fit into the TPS slot properly as orientated and without turning it cw or ccw? You have to put it in a 1/8 turn to the right, then turn it to the left to up the screws back in. A jammed or misaligned TPS can cause all the symptoms you are experiencing. Also, start it up and disconnect the TPS connector and see if it makes a difference. Also, did you reuse the IAC gasket when you transferred it over to the new TB or use a new gasket? They are sometimes difficult to remove w/o tearing them.
SBpunk Posted August 12, 2015 Author Posted August 12, 2015 I'm not sure if my TB was aftermarket but there wasn't a gasket when I removed it. I'll double check when I get home. When installing the fuel rail I unplugged the MAP sensor up top and didn't notice. It got rid of my trouble codes but now I have a slight stutter in the motor at idle (hot and cold) with a cold backfire from the exhaust. Before adding all the new stuff it ran smoothly. The RPM gauge isn't bouncing but there is a decent engine vibration that wasn't there before. The only thing I can think of is when I was trying to run it without the map sensor plugged in properly I might've fouled a spark plug or O2 sensor.
SBpunk Posted August 13, 2015 Author Posted August 13, 2015 Unplugged the o2 sensor at startup and no change. Still idling around 800rpm with a stutter and engine vibrations. Anyone have any ideas?
ggcnash Posted August 13, 2015 Posted August 13, 2015 Post up some video gonna take awhile to run smooth computer must learn new parts. What codes are you getting now?
Akula69 Posted August 13, 2015 Posted August 13, 2015 Hmmm. After the vacuum leak did you try and drive it for a short distance (but during that drive maintain 30MPH for at least 30 seconds) for the IAC to "learn" its settings? Also - check the adjustment on the throttle cable. I can't find the link right now on adjusting it - but it's simple.
ggcnash Posted August 13, 2015 Posted August 13, 2015 Just mentioning when I changed injectors and TB my truck ran like $#!& for a couple days, how bad is it?
Incommando Posted August 14, 2015 Posted August 14, 2015 Mine ran like crap for several re-starts. Then cleared right up. 91 OBD 1
SBpunk Posted August 14, 2015 Author Posted August 14, 2015 Sorry wasn't able to tinker much with it last night but I did discover I unplugged the MAP vacuum when I was putting the fuel rail back in. She's still stuttering slightly not even enough for it to show on the RPM gauge. I'm guessing the computer just needs to relearn. I'm taking her out for a drive tonight on the highway. I ordered some new spark plugs just incase I fouled any. If I'm going to pull and check them I might as well replace. After that I'll move down to the O2 sensor (which I need to remember to plug in) but hopefully it won't be necessary. I'm probably going to be returning the intake back to stock since the cowl one is insanely annoying.
ggcnash Posted August 14, 2015 Posted August 14, 2015 Yea, can't remember how many starts is required. I think 50 for the computer to adjust to mods I also reset my computer before first restart.
SBpunk Posted August 14, 2015 Author Posted August 14, 2015 Plug the O2 sensor in first! Yeah definitely. Completely forgot when I drove it all of 1/4 mile to work today but it doesn't really kick in until the truck is warmed up. Usually if the O2 sensor is bad and causing the engine to screw up when you unplug it the engine corrects itself. Tried it out then the manifold got hot as hell so I planned on plugging it back in this morning. Completely forgot.
ggcnash Posted August 14, 2015 Posted August 14, 2015 It will effect the computers process of gathering info though hot or cold.
Incommando Posted August 14, 2015 Posted August 14, 2015 Yea, can't remember how many starts is required. I think 50 for the computer to adjust to mods I also reset my computer before first restart. I forgot the rule about disconnecting the battery during the repair to reset the thing
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