frigging frustrating
#1
frigging frustrating
Short story:
85 SE, replaced running four port with original,(off another running/wrecked car), six ports. Turned key, car floods, went through FAQs, archive tried it all . Cursed a few times. Car does not floods as bad, but it does flood some.
Tested everything, injectors, pump, ignition & wires, changed plugs, change computer, changed injectors, changed fuel pump, put gas, in tank, cursed some more. I have good ground, fully charged battery, good wires, good coils, good rotor and cap.
Twice I've gotten in the car after sitting overnight and started it for a second. After that initial puff, nothing. Yesterday, I pulled the car around the neighborghood and still would not start. Went through everything on the service manual and still can not figure out what is going on. I usually do not ask for help since most of the time I can figure things out withi in a couple of days. I've being working on this thing for about a week and Im about to set it on fire.
Can some one help me out. I am sure that I am overlooking something small.
85 SE, replaced running four port with original,(off another running/wrecked car), six ports. Turned key, car floods, went through FAQs, archive tried it all . Cursed a few times. Car does not floods as bad, but it does flood some.
Tested everything, injectors, pump, ignition & wires, changed plugs, change computer, changed injectors, changed fuel pump, put gas, in tank, cursed some more. I have good ground, fully charged battery, good wires, good coils, good rotor and cap.
Twice I've gotten in the car after sitting overnight and started it for a second. After that initial puff, nothing. Yesterday, I pulled the car around the neighborghood and still would not start. Went through everything on the service manual and still can not figure out what is going on. I usually do not ask for help since most of the time I can figure things out withi in a couple of days. I've being working on this thing for about a week and Im about to set it on fire.
Can some one help me out. I am sure that I am overlooking something small.
#2
Lives on the Forum
iTrader: (13)
Check and see if the fuel pump comes on with the key in the on position before you start to crank.
Forgot to add. Did you do a compression test? Also did you verify you have spark out of leading and trailing sides?
Also need to know how old is dist rotor?
Forgot to add. Did you do a compression test? Also did you verify you have spark out of leading and trailing sides?
Also need to know how old is dist rotor?
Last edited by Rx-7Doctor; 07-13-06 at 04:21 PM.
#3
compression and apark
I did not mentionet it since it is some of the stuff cover on the FAQs and archive. BUt yes I did check and the pump does not come with the ignition on. Compression is at 140 front and rear on the trailing and somewhere around 120 on the leading plugs.
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#8
not to hijack this but i don't remember if it was you rx7doctor or maybe gsl-se addict that posted a set of steps which involved every electronic component down the line to fire the sparkplug. i knew i should have saved that.
#10
Lives on the Forum
iTrader: (13)
Originally Posted by leknaw69
The original thermo sensor broke off. I have another plug to thw wire that came off a second gen. I have a brand new rotor that I am saving for a rebuild. Does the thermo sensor makes that much of a difference?
And as Gavin has stated, yes it does make a big difference. The coolant temp sensor usuall y when it goes bad has high resistance which tells the computer to richen up. If the connection is bad to the sensor and there is no signal to the ECU the motor will not start.
Try that new rotor also. Also like i said look at the flap door on the AFM. Is the AFM the same one that you were using before? Did the engine backfire at anytime during your initial steps to start?
Gavin, i dont remember if i posted about that or not. It might have been gslseaddict.
Also check all of your fusible links that are associated with the injection system.
#11
Thermo sensor
That makes sense; But it should;nt keep it from starting. The small amout of fuel that is setting on the plugs is not that bad to keep it from starting. I am leaning more towards a lack of spark thatn too much fuel, but the fact that the sparke is present throws me off...
#12
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iTrader: (13)
Originally Posted by leknaw69
That makes sense; But it should;nt keep it from starting. The small amout of fuel that is setting on the plugs is not that bad to keep it from starting. I am leaning more towards a lack of spark thatn too much fuel, but the fact that the sparke is present throws me off...
#13
well that sounds like a timing issue to me then, here's a couple good links to set it if you like. https://www.rx7club.com/1st-generation-specific-1979-1985-18/help-may-really-long-368922/
http://members.optusnet.com.au/~onec...-%20part%20one
https://www.rx7club.com/1st-gen-archive-71/ignition-main-pully-timing-525909/
http://members.optusnet.com.au/~onec...-%20part%20one
https://www.rx7club.com/1st-gen-archive-71/ignition-main-pully-timing-525909/
#14
timing, minor common sense stuff
First thank you guys for working with me on this. I do belive more than one person brainstorming comes to a quicker and reasonable solution. I have set and reset the timing. The motor in the car came out a running car so none of the pulleys were off the motor. The distributor was change and place in the proper manner, (alignment). I am really leaning towards the thermo sensor, provably creating the frustration.
There are not many rotor heads in the area so the availlability of parts is minimal. Will make some calls tonight and try to get a sensor from someone. What else I need to do other than replacing the rotor?
There are not many rotor heads in the area so the availlability of parts is minimal. Will make some calls tonight and try to get a sensor from someone. What else I need to do other than replacing the rotor?
#15
Old Fart Young at Heart
iTrader: (6)
Iirc, none of the thermo sensors, coolant or intake air would cause a no start, as the ecu will default to one limit or the other of the sensor, if no reading is present.
Wet plugs are a clue, take them out and clean them. At this point, you may need to de-flood.
Wet plugs are a clue, take them out and clean them. At this point, you may need to de-flood.
#16
Lives on the Forum
iTrader: (13)
trochoid, sorry i am going to have to correct you. Your theory on the Ecu would be correct if we were dealing with todays Obd2 or 1 systems.
A bad coolant temp sensor 99% of the time will cause the ECU to dump fuel. A lack of signal from the CTS or being disconnected will not let the car start. This is a FACT.
A bad coolant temp sensor 99% of the time will cause the ECU to dump fuel. A lack of signal from the CTS or being disconnected will not let the car start. This is a FACT.
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