new to the site but need help

[markz34]

hey im new to the site . i own a 91 lumin2 z34 . ive owned it for 2 years now and it have 187xxkms on it . it was replaced at 150xxkm the most recent one . and i havent had one signal problem with it . ive done all the regular maintenice to it . and i parked it for 2 months and now it will not start. i drained the gas tank put new 94 octane gas in it. gas wasent the problem . i hear the fuel pump turn on when the key is turned on to acc. i get fuel to the fuel rails . i checked the spark to all plugs and wires its white hot spark so its strong. the car turns over and everything but its doesnt start up. the starter works fine .
ive got it to start up once but it took me over 5 hours of playing around to fire up but when i shut it off it didnt start back up. when it started it ran perfect just like it did before i parked it. but it will not start up again. ive ran out of ideas now so im in need of some help.
iam sure the timing is not off because i drove it for months before i parked it and it ran mint.
1. got spark
2.got fuel
but doesnt start
it has all new plugs,air filter, pcv, timing belt, alt, starter
ive heard with these motors if the egr is clogged it wont allow to start to car is this true?
or could it be that the injecters are clogged? but then why would it run good when it started?

im just upset with this car because i dont understand why it wont start up at all but the one time i did get it to start it ran like there was no problems.

can someone please help me with this. iam not a noob when it comes to these motors i know quiet a bit about them and how to work on them but i just dont know this problem.
thanks
mark.

[SappySE107]

Put a fuel pressure gauge on the rail and turn the key on. Check pressure. Crank it over and watch the pressure gauge. Need to make sure the injectors are opening.

It will start with the EGR passage blocked.

[z34phoenix]

i would also pull the battery and let the PCM reset.

i also noticed that my car never liked 93/94 gas when on the stock programing. but that shouldnt keep it form starting..

you check that the spark plug wires are in the right place? and all the injector harnesses are correct and plugged in? wiht no breaks in them.

[markz34]

yeah all the plug wires are in there proper spot. but iam curious if the injecters are clogged why would it run perfect when i got it to run ?

[davida1_hiwaay_net]

Have you looked at the temp sensor? It is completely involved with starting air fuel ratio. ECM uses a "substitute" value if the sensor breaks. This value is good for a warm engine but cold starting will be difficult or impossible.

I've seen the connector corrode while sitting and give a bad reading. Have you any codes in the ECM?

David

[markz34]

no there is no codes being thrown . where is the temp senor located? because last time i checked my gauge worked fine for temp.

[davida1_hiwaay_net]

Mark, I'm not sure acctly where the temp sensor for the 3.4 TDC is located. There are 2 sensors, one for the ECM and one for the gauge. It is normal for the gauge to read correctly as the ECM sensor fails.

[markz34]

hmm well ill need to find where the sensor is located to check it out . thanks for the help .is there any other suggestions though?

[MONICAZ34]

would this issue cause a secondary miss??

[davida1_hiwaay_net]

Temp sensor can cause severe rich condition and flooding if it reads false COLD. ECM stays in cold-enrichment mode and the engine can lope and run rough and foul plugs.

If the temp sensor reads false HOT the ECM will not provide enough cranking fuel to start the engine; because it thinks the engine is already warned up.

I don't see a temp sensor causing a "miss." But strange things happen and different people define "miss" different ways. I define it as one of more cylinders that never fire, the engine has a definate "abnormal rythm" that is regular and repeating.

A "misfire" would be random rough running not always the same cylinder. That's just me and different terms may be used in different regions of the continent.

Later,
David