1990 N/A 215,XXX (No known history of a rebuild), 5 spd. Stock

Starts fine, no smoke (unless revved really high on morning start-up, which is retarted and I never do it, only reason I know becuase previous owner informed me)


When Im driving (warmed up) and I decide to punch it. I get to about 3900 and I feel a slight boost in power, and it will be good till it gets to about 5900-6000 and all of a sudden it will drop power and then once it get to 6300 return to going (the car will jump almost like shifting).

The car does idle high, but if I have the a/c on idle nice and steady. While running the engine almost looks like it jumps (possible missfire but unsure), but again when I have the a/c on it is fine, (the jump is not near as significant).

When I shift at high rpm's (7k) it will make a loud popping noise comming from the exhaust.

I have been told it is a possible coolant seal (due to a slight sweet smell comming from tail pipe after car is off after a drive), but am unsure. But, Ive also been informed that there might also be a vacuum leak. Again I turn to the rotary guru's seeing as there is no one near where I live other then RR&R in gardena (comes with a high $$$$).

Can anyone help me on this issue? Is it rebuild time, and how much time do I have? Is it cheaper just to get another engine, also considering it has 215XXX miles on it.

If you guys can help me here (quick reply) or pm me. Id like to know.

Thanks.
MazRx7FD

 

nothing that you've said sounds like a dead or dying engine to me - it starts fine, sounds like you have power and no really big smoke.

the idle issue could very well be a vacuum leak - i'd reserve a day (or night) and go through your FSM and make sure every vacuum hose or potential leak is in order.

when was your last tuneup? that's probably what i'd suggest after you've checked vacuum leaks.

 

My last tune up was march, but I recently had a normal 3000 mile service + brakes. My mechanic said I dont need a tune up at this time, but I think when I get paid I might get one anyway. Better safe then sorry. 6 months is a long time.

Ill check for any vaccum leaks when I have time thursday (my next day off), and update this, Im hoping that I can find it and everything will be ok. Thanks for the input, and I will get back to you.

 

well i was particularly curious about the fuel filter, plugs and ignition wires. so with the exception of the plugs, which can foul at any mileage, if those were addressed in March, then you should be okay exploring other avenues. although, i must say that when diagnosing things, i've learned to start with the simplistic and move up from there.