Neobeatz

This is what i have noticed

i have been experiencing that when i drive the car for a while, and the engine has warmed up i go to the store and when i get out and go to start my car, my car wont start i have to crank it like 10 times to get it to start with several minutes rest in between and once it cranks give it gas

i read in here that if theres carbon build up in the engine this could cause low compression so i have been driving my car a little harder now 3 to 4 grand sometimes 5 between gear shifts but i have noticed that this only aggravates the problem what can cause this ,

or is my engine doomed.

RotaryRocket88

iTrader: (7)

Hot start problems are extremely common. Fuel cut switches are common band-aid fixes, but they won't truly fix the problem. https://www.rx7club.com/showthread.p...ight=hot+start

In some cases, leaking injectors can flood the engine after it is shut off. Residual fuel pressure can drive fuel through dirty injectors and into the engine. Low compression is not going to help, but it is generally not the root case. You can compression test your engine if this is something you're worried about.

mreed772

I have this problem too occassionally. I'm sure the main cause is the injectures but i have noticed that it happens much less after I have replace the spark plugs. A friend of mine used to have to replace his plugs every 6months due to all the mods he had done to his motor.

Neobeatz

thanks for the input , my engine was rebuilt 7 years ago by pineapple racing could it be low on compression this soon or do you think its a tune up issue and the car has not been driven hard that i know mostly sat which could be the other issue old lady owned the car

Neobeatz

and i have done most tune ups since i got the car a year ago including spark plugs you think they might need changing again ive put 14000 miles on the car so far

Marx-7

Yes, as far as i know the sparkplugs should be renewed every 10.000 kilometers or so.

Sgtblue

iTrader: (16)

Every car is different, but I've gotten more than 6200 miles (10,000 kilometers) out of my plugs. But I think 14k miles is getting there on most rotarys. A set of plugs isn't expensive and it might help. Good time to check compression and what the old plugs look like might tell you something too.

lildav

I've have the same problem too, but my problem started to happen after I change my spark plug but... I know its my fault cause I tweak the timing and didnt put the right octane in so it didnt go so well but what I usally do is before turning off the car right away from a long/ or hard drive is I would let it site for about half to a min and it would usally help most of the time.

eliotz28

check your fuel line to make sure they arent getting to hot and vaporlocking the engine

Neobeatz

Thanks I will try all this i have my Ngk platinums ready to install my wires look good

eliotz28

make sure you check the spark plug boots for sign of arcing like pinholes or carbon traces.

mazda_drift18

is there any chance that when the motor gets so hot it kinda of just rejects the fuel like it wont take in fuel when you try and start it?

Neobeatz

Not sure

RotaryRocket88

iTrader: (7)

No

Neobeatz

Changed everything this weekend seems to be better but yesterday my idle went low after it started for a sec I gave it a little gas two times and and then I went to normal idle again ? Not sure

Neobeatz

Btw I changed my oil and spark splugs my neither seemed to bad I change my oil every two thousand miles this time it was 2500 and the plugs had a little black and tan at the end wires were like new

lildav

That might be carbon build up? Usally to release your carbon you want to red line it about twice a month? I usally do it every 3-7 days, reason to be that my rx7 is my daily at the moment

canonize-ryda

i redline my 7 everytime i drive it .... lol but thats why i have it, also would injectors to be to blame when u start the car in colder weather it dies like 5 times and u have to give it gas to keep it going for a few seconds but after that it runs peretty much steady with some rpm drops at time to time, the lowest being around 5-600 and regulating around 700-750 rpm idle

angeloajc

good info its gonna help me 2

lildav

you know what? I had the same problem when I first got my car and it would rev high (@3 or 3.5) than it would drop to 100 than its tumble a bit than it die. but after I change the oil and always make sure I mix oil every now and then with fill up and change the plugs and wire and after that for me it stop dieing on me after its rev high than it drop but it would drop to like 1k and I would tap the gas than my choke would kick in than rev at 2k.... My car got better after I sea foam it. Also I would do some time is add fuel injector cleaner in it to clean most of the gunk of the injector. Its help alot... well to me it did. Dont go for those cheap brand name fuel injector cleaner. Go with, lucus or cheveron fuel injector with techron in it. Thats really help. Techron is the real deal.