87 iroc tpi 5spd 383..normally runs perfect..no changes made in over a year..mods...hooker headers with air tubes, high flow cat, flowmaster exhaust,msd coil,super chip, custom frame ties..of course 383....car begin to be hard to start last 3 or 4 times but always cranked(long crankovers)wont even start off fluid.will give a little pop but thats it..wire will shock you if you grab it but barely see it..44psi fuel pressure...parts replaced..dizzy pickup coil,plugs, wires,cap,control module,ignition coil,ecm temporarily swapped,fuel filter..done basic checks..coil voltage,,inejctor testing....this is my final attempt,then probally will sell as is part out.
if anyone local or have advice feel free to call..605 924 0611..ill be working on one of these..well not the Lt1 car as its perfect for now.

 

in search of knowledge or someone who wants to get their hands dirty

 

Hey Brother, I'm pretty much having the same problem with mine. It was getting harder and harder to start so I replaced the fuel pump. Now I have great pressure and no start! Did you check for any codes? I'm headed out to the garage to fool with mine. If I come up with anything I'll pass it on. Oh, by the way, It would be a shame to part that car! Good luck Bro.

 

no codes when last driven..yea id hate to part it..no body damage..no rust...it actually passes smog check..no engine codes when last ran or present..the funny thing is i actually have a modded lt1 intake for it,but dont wanna mess with it till runnin right...how much spark do you have..

 

My neighbor helped me with mine, said it was vapor locked. I had 60lbs of air pressure at the rail! What are the symptoms on yours? I do have a FSM, need to find it though.

 

just spins over...bled shreader valve to make sure. ...spray in starter fluid..doenst even react..reset to top dead center everytime to make sure..only thing i didnt change is complete dizzy...old coil was worn extremely...everyone says no need for new dizzy....every now and then ill get a small pop with starter fluid...maf sensor also replaced..tps replaced ..wtf...i wont carb it..itll get rid of it or part it first...im just not a carb guy...

 

sounds like a spark issue, starting fluid SHOULD fire it. compression test?

 

Chevy8588- Good to see you again!

Dare I ask.....could it be his MAF relays(2)?????

This link should be of help to you irocwagon......
https://www.thirdgen.org/forums/tech...art-story.html

 

yea your on point..doin compression test tomorrow...car ran like a beast last time i drove it....after this test i dunno what else to do....
switched maff relays also..ive done almost everything i can think of

 

[quote=irocwagon;4556383]87 iroc tpi 5spd 383..wire will shock you if you grab it but barely see it..quote]

Are any of your wires up against any metal surfaces?.....Is it possible to be losing spark due to bad wires??? Maybe there not arking out, but just losing volts?

 

irocwagon, I can see that you have replaced alot of parts so far, are you able to make a list of the order in which you replace ALL those parts(ex. step1, step2......etc.)

And please don't skip any parts!!!!!

 

the blue car is the one with the problems...aby the accompanied white LT1 T56 car and the vert

 

ha..i dunno..plugs,wires,module,ign coil,maf,maf relays,everything else.. dizzy coil was ...was set to top dead center after every part change.............wires not on metal...8mm wires,blue silicon ones..expensive but not helping

 

with ignition on is service engine soon light off? does adld come on? any codes? check if tps is over 2.5 volts closed throttle!!! and is rpm indicated while cranking?

 

service light comes on when ign on then off...tach rpm flutters whils crank attempt...have to check tps voltage...adld??

 

The ECM also monitors the TPS (Throttle Position Sensor mounted on the throttle body assembly) and wants to see .54 volts at this time. If it sees appreciably more than 0.54 volts, it will assume the engine is flooded and the driver has pressed the accelerator to the floor to clear the flooded condition and restrict the fuel flow as a result. (.54 volts during start and at idle from the TPS is very important to both starting and run performance.) ......just a thought but doesn't help the ignition prob!!

 

Sounds like you've tried just about everthing but here are a couple more things that might be worth checking just in case.

1. You said you replaced your ignition module. Is there plenty of grease between it and the base of the dizzy? If not it will short out the module and will result in no start.

2. Check the wires that go to the top of the ignition coil. Trace them back as far as you can to make sure they are not frayed or damaged. Also look for cracks in the insulation that might allow moisture inside.

Sounds kind of silly but I've had both of these problems which resulted in no start and it was a bit tricky to track down. You wont get a code for these problems either. Good luck.

 

to be honest i think there was just a little greese under module..guess that could result in low spark?

 

Definately. The first thing I would do is go to the auto parts store and pick up one of those little packets of dielectric grease they have up by the register. Take your module off and wipe it off really well then apply a thick layer of the new grease and reinstall it. If it did short out it might have fried your module so if the grease doesn't work don't rule out a bad module.

I just did this yesterday and it fixed the problem immediately. Before that I had a couple of long starts and then no start. Easy fix, I hope it works out for you.

 

yea gonna try this when i get home...thatd be like winning the lottery if it works

 

still no start..only option i know is new dizzy...thats next..

 

Brother, did you check to see if you have spark at the plugs?

 

car has been at shop since 5/30 and still no start..this shop specializes in third gens...upon calling today i was told that i might need to find a new shop cause they are real busy...wtf..i need a mechanic or shop near columbia sc.asap....someone step up and work on this car...i see a part out about to happen..i wont own a carbed car so ill part out first

 

It sounds for all the world like you have weak or no spark. Have you checked for proper voltages at the dizzy? It should run on starting fluid, if it won't, you have too weak of a spark.

 

THATS BS!!!!! They should be busy with your car!

 

12 volts at dizzy.........countdown till part out soon....DAMN SHAME

 

Did you remove the Dizzy? What did you set her back in at in degrees? I'm starting to think I need a timing chain.

 

pul a valve cover and crank the motor, see if valves move. soubnds like snapped chain or cam, or at least stretched to the point of the timing being way off and no fire because of it

 

gonna oull off v cover and inspect...i can deal with that,as long as i find !something wrong...sure would be nice for someone to fix this car...willing to pay..i need this running asap!

 

If I wasn't so far away I'd work on it. Can you check out the regional boards and find someone local to help?

 

local mechanics or referals neededddddddddddddd..please post up

 

Did you check this? Pull the valve cover and crank and watch the rockers

 

Hello, I am new to the web site,checked the roter for burn thru?

 

UPDATE US.......Please!!!

Have you pulled off the valve covers yet????

 

Or just pull the dist. cap and see if the rotor turns when you crank the engine.

 

damn it car still dead...dizzy turns....tried different computer...but gonna buy a new one thurs..well remanufactured.....dont know what else to try...still not gonna carb this car

 

When you touch the spark plug wires while cranking the motor, do you get shocked? If so, pull a spark plug out of the motor and hook it up to the wire and ground the threads on the block. Then crank the motor and watch for spark. If there isn't much spark but you get badly shocked maybe you could swap out your 8mm wires for a set of factory wires. Your 8mm wires may have too much or too little resistance. Good luck, I hope this helps.

 

1st time i heard that suggestion..ive always had 8mm on there..but yea faint spark but will shock the mess outta ya...may try factory wires..worth a shot till puter comes in.

 

Sounds like a bad pickup coil in the diz. Look down inside the diz, for dust or afilm kind of layer of crud. I had this happen to mine, replaced the p/u coil and it ran fine, worth checking out...Good luck

 

I had the same problem when I first got my firebird in January of 2010. All I did was change out the spark plugs and make sure the gap is correct.

 

You have the patience of a saint. Over 5 months! I'd have burned the car by now!

 

There are 100 guys in your town that can tell exactly what it's gonna take to get that car running. My guess is it won't take much. Ask around and find him. An older guy that's familiar with older GM vans and pickups. They run on exactly the same principle as the TPI.

 

what is the battery voltage? an H.E.I. equipped car usually will refuse to start if battery voltage is at all below 12v. even 11.5 can cause a problem if the coil is iffy.
battery voltage should around 13v.
where did the replacement coil come from? is it from advance, or is it some ACCELL crap?
if low voltage is the problem, IT WILL NOT START ON ETHER. ever.

with as much money as you've spent on parts already, you may as well get a new battery too. just to be certain.
or pull a known new battery out of another car.
fyi, batteries lose voltage at about 2 years old, regardless of mileage.

or you can bring the car to me and i do have the time to work on it,
probably too far away for you though.

 

where are you in nc..has new battery in it also...

 

maybe you have to much gas going into the motor thats what happened to mine

 

wilmington

 

ok this has gone MORE than far enough here, this needs to be diagnosed, not hav parts thrown at it, for all you know, a squirrel coulda chewed your harness and everything you do is just pissing into the breeze, check voltage at the dizzy harness, hook up a scanner and check ALL sensor outputs, check your fusible links, check for good grounds

 

Happy new year to all....first off my car hasn't ran a day in 2010....so i was off today so i decided to go to the shop and see my car..well i picked a computer..didnt know what year it was from so i was doubtful..got to the shop, they say they ordered a computer but that was almost 2 months ago so i wasnt sure if it was there since it wasnt inthe car yet..put it in and now had spark but no crank..put my puter in..more spark no crank...starter fluid..now popping..timing adjusted..now car running..tried various combos to find out my superchip was bad and timing was way off well at least by new prom specs..anyways car is running now...on the last day of 2010..wtf guess she didnt like this year..thanks for everyones input..i tried all ideas suggested..exhausting but shes alive..time for celebration and bring the new year in...

 

awesome to hear. Happy New Year

 

well not perfect but it will run.needs starter fluid for initial crank...always now...fuel pressure bleeds off when ignition on before cranking...digital gauge inside...it goes 47 46 45 44 43 38 35 33 28 19..will stay around 43 when running..hit the accelerator..somtimes it goes up sometimes not...also tried with mech gauge.same thing...bothersome problem