I just recently put a new set of shorty headers on my 86 iroc and while I was at it replaced the thermostat to 160. My plan was to drive the car to the shop and have the exhaust made but not, like in an earlier post, the car starts momentarily, then dies. Is this also the MAF or loss of vaccum from the exhaust?
Thanks, Ben

 

now the question from me is, when you get the car to start if you give it gas does it choke and run like crap? if it does, unhook the MAF and start the car, if it stays running then yes it is the MAF, or it maybe the timing, i know it seems odd but i skipped a tooth on my distributer at one point, dont know how, as for vacumm stuff, i read that our cars run better with less backpressure from the exhaust because our motors are 4 stroke instead of 2, like many 4 bangers are, so it would be very hard for it to be the exhaust, i am going with your MAF is toast and/or your timing may be off. i currently have no exhaust except for stock manifolds down into a Y-pipe and it runs fine(aside from a bad sensor or ground wire), try checking your TPS also, sounds weird but that is where my prob is, hope this helps some or gets you in a direction to fix your car

mike

 

thanks mike...
I am going with my MAF also....today I am going to unhook it and see if it stays running because now it just starts, then dies right away. There are no codes now but MAF codes did come up awhile ago. I will unhook it and see what happens, thanks-
Ben

 

are you trying to say most 4 bangers are 2 strokes rather then 4 strokes?

 

:sillylol: :sillylol: :sillylol:

91camarors305, All 3,4,5,6,8,10,12 cylinder internal combustion engines in automobiles are 4 stroke.

 

It's not the loss of backpressure. I did the same thing, once I installed headers, I could run the car with out the y-pipe installed.

Check everything and make sure that it is hooked back up correctly. Did you reinstall all of the plug wires correctly. I know this might sound like you don't know what you are doing, but I have to ask.

After the MAF, if it is still doing it, then move to the IAC motor. Then post back.

 

i was under the inpression from another post i once read, but i never really understood the difference

 

well they do have 2 stroke diesel motors that have 3 or more cyl.

and also don't forget the rotary is a 4 stroke also

 

Well, I just got back from checking the IROC out......I even checked the plug wires I had them marked before I took them off. Well, The motor turns and sputters but nothing. I pulled a few plugs out and they were fouled as all hell so....I am going to replace the bosch +4s (which I should never have bought anyways) and I will get some AC Delcos in. Is the IAC valve under the throttle body? I thought it was and it looks as if it had been recently replaced but that is what us TPI guys have to do. Go through the motor piece by piece and find the problem, right?
I will check again tomorrow-
Ben

 

Man I should have asked. I ran bosch platinum 2s for 400 miles, then they crapped out on me. You can't run platinums with the HEI coil. Sometimes you can, but most of the time you can't.

If you look in the haynes/chilton manual they tell you not to use them.

 

Cool...Cool...Cool
So that is one problem I am sure to fix. I had a local mechanic-friend check out my car and he said it sounded like some wires were crossed, so we checked them and they were ok. So I pulled the plugs....they were in terrible shape. The motor was trying, I will give it that much. I will post later when I have fixed this problem.....thanks maroon iroc-
Ben

 

why wouldn't you use platinums?

I swear other cars are using them with a HO spart system

 

dont use platinums, they are terrible things, i had them in my v6 carbed cutlass and they bombed out after like 4 months, i got AC Delco, the aluminum ones for the 350 and they are great, they run cooler and are a lot cheaper, i gapped mine to 45 i believe, but DO NOT go bosch, as will every other person here will tell you, if you want to spend money, i think the name is like titanus(something like that, some one correct me), but they are titanium plugs that run 10-12 bucks but are really good plaug, but i have no idea where to get them, or you can do a search and see what you can com up with for spark plugs

 

91CamaroRS305

Time for a quick basic engine lesson.

4 Stroke (same as 4 cycle) = Intake, Compression, Power, Exhaust
STROKE #1 (INTAKE) - Crank and cam are turning - intake valve is open, piston is moving downward- fuel/air is sucked in through the open intake valve, intake valve closes.

Stroke #2 (COMPRESSION) - Crank and cam are turning, both valves are closed, piston is moving upward, fuel/air mixture is compressed.

Stroke #3 - (POWER) Both valves are still closed, distributer sends electricity to spark plug, plug sparks, fuel/air is ignited, burning gasses/heat expands, piston is moving downward now (rather quickly)

Stroke #4 - (Exhaust) Cam opens exhaust valve, piston moves upward, burnt gasses are pushed out of the cylinder, when the piston reaches the top, the intake valve opens, then.....see Stroke #1.

2 Stroke (same as 2 cycle)
Stroke events are combined, the 4 previousely described events happen in 2 strokes of the piston instead of 4.
2 strokers dont use 'traditional' valves as you may imagine, they are usually 'reeds' or similar devices.
2 Strokers almost always use an oil/gas mixture.
2 Strokers are usually very, very high revving.
Usually found on weedeaters, chainsaws, and lots of motorcycles.

Whew....hope that clears that for ya.

Cheers
RB

 

thanks slackett, makes sooo much more sense

 

are you sure they are very high reving?

I was looking into some two stroke stuff
most seem limited to about 3600-3800rpms