Quote:
Originally Posted by rwd1960
I have a 90 tracker w manual trans 1.6 8v motor. It died one day and wouldn't start unless I pull started it. It would then run as long as I kept the rpm's high and die when I let off the gas.
The cat converter was removed from this tracker and it ran rich.
pulling catcon, will kill the egr, and will make ECU sick and run in limphome.
on most kicks. (limp home is rich and retarded spark advance rules)
It has a new coil, distributor, vacuum lines, plugs and wires. Done ecm flow chart test for "cranks but won't start" says replace ecm.
Sent it off and had it rebuilt as well as tried a used computable ecm but it still won't start. (ecu must be for this year)
Ohms test of tbi was good and it clicks when energised.
I dont know what you did to TBI.? (ISC is my guess)
Checked belt slip but the alignment teeth on both sprockets are lined up. I get spark at all 4 plugs.
The voltage coming out of the ecm with the key on was out of range going to the isc.
Wierd part is I traced the violet yellow wire from the ecm to the instrument cluster to find the switch that resets the service light.
I had the cluster out then plugged all the conectors back in and reassembled.
The tracker started right up and ran well. I shut it off and restarted it three times. it ran each time. I went back out later and it won't start again and hasn't run since. What am I missing?
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comments:
on any old car like this:
(the
full tune up i wont mention, heheheh)
compression readings. WOT.?
is vacuum steady? about 19 inchs.
then check ECT hot and cold. (no broken wires) 200 ohms hot it must be.
and near 2000 cold. higher if colder than 65F.
If you have a SES function (only on USA FED48 cars) then remove connector C3 on the back of the speedo and forget SES for ever., then activate the CEL DTC by placing the DIAG fuse in its socket.
the EGR must be working, and not leak at idle !
it must open when crusing
the EGR must see a CATCON or the EGR modulator will jam full open.
this effect will really screw up AFR. (air fuel ratio) cruising.
TPS ( side both sides must be good)
the POT side must be good, and the wiper must sweep end to end with no glitches.
the switch side of TPS must close (<300 ohms) {less than 300 ohms}
if the switch does NOT close, the IDLE ISC WILL never activate and
controlled idle will never happen.
the 20 year old ISC will have a bad valve seat , 99% there.
the ISC is modulate at 200 times a second and a DSO is needed to view it.
DSO , digital storage Oscilloscope.
now lets explain LIMPHOME.
Failsaft now what?
the other causes of rich:
fuel pressure at 2x the spec. 65psi is the dead head pressure and is illegal
this car is at 34-39 psi ( filter banjo test port)
over 59 psi is dead head,
if the pressure regulator is stuck closed , you will get over 59.
and car will run rich as a dirty pig.
Key points:
1: pressure fuel. at spec.
2: ECT working and correlated to below temp.
3: motor gets to 180F (82c) full operating temperature !!!
4: working Catcon.
5: egr not leakinig, EGR passes stall test.
6: solid non pulsating vacuum. needle steady! good cyl. compression.
if you have spark and fuel and it cranks and dont start
then press throttle to the floor ,this activates magic unflood mode.
killing all injections, while cranking.
press foot
crank.
start,
see black cloud.
