Z waterpump issue and RPM issue.... HELP

[datsik707]

Need some help or input. Z problems again.
1. Had SERIOUS overheating problems one day, leaking from a bad pump. Keep in mind this pump worked for months when I bought the car up until it going bad. Replaced the waterpump and she worked like new, then today, it started to overheat then went down to normal. I'm nervous..
2. Strange problem, when driving and I put in Neutral like coming up to a stop or such, sometimes the RPM's will go to 1200, then 800, then bog down to 0. Sometimes it catches itself and goes regularly, but a few times it's just straight died out on me. Restarts fine though.
Thoughts?? Maybe change the fuel filter for #2? MAF for #2? Will put up codes later if there are any..

[t.mcginley.jr]

When you say serious overheating, how bad was it? How far up the temp gauge was the needle and for how long?

For the other problem, could be a bad MAF or TPS or clogged/stuck IACV, etc. Codes would help if there are any

[Ace2cool]

Most likely has a coolant bubble. You should burp the radiator. Park it on a steep uphill slope, chock the wheels and set the E-brake, start the car (while cold), turn the heater on (max hot or 90*, depending on manual/digital controls) and remove the radiator cap and the bleed screw, and add water as the level goes down.

And as for the other issue, Check what McG said. Most likely will be the MAF. Or a vacuum leak, but the vac leak would make it run like crap all the time.

[datsik707]

Most likely has a coolant bubble. You should burp the radiator. Park it on a steep uphill slope, chock the wheels and set the E-brake, start the car (while cold), turn the heater on (max hot or 90*, depending on manual/digital controls) and remove the radiator cap and the bleed screw, and add water as the level goes down.

And as for the other issue, Check what McG said. Most likely will be the MAF. Or a vacuum leak, but the vac leak would make it run like crap all the time.

Not a vac leak, I can tell you that right off the bat. I'm thinking MAF now also, but it's only happened 3 times in a month so the overheating is my first issue to fix.

Update:: Burped the radiator, took about 1/5 more coolant from the bottle. Worked great for 50 miles. Then today It started to get 3/4 of the way to overheating. So I check my levels and it took about 1/3 of the bottle again. Now it's completely full. 30 miles later, it takes about 1/8 of the bottle. (note: these are the big, pre-mixed bottles at local 711's of coolant). So when my waterpump went i would lose all of my coolant fast, and only chance I have of not overheating is air-cooled from speed(lol). Now it seems almost like a slow leak, (well, slow in comparison to a bad waterpump). Maybe a bad seal? Can't find any leaks in the coolant hose, Any one got some ideas or help? What else can I check?
Note: Specific is best please, my knowledge is limited.

[Ace2cool]

Heater core hoses, under-plenum coolant lines, and water pump. My water pump was slowly leaking from the seal of the shaft.

[datsik707]

I'm pretty sure that's where mine is leaking, not the weep hole. It's a decently slow leak. Got it on a lift and only found a few droplets on the belt cover underneath. So was the gasket a bad seal or something?

[Ace2cool]

I just replaced the pump. Z32 water pump is inexpensive enough to justify buying a new one and returning the old one for core charge.

[datsik707]

Last one I got was a remake, so no core charge. I'm guessing I should buy a new one this time. You buy online or?

[t.mcginley.jr]

When it comes to timing belts/water pumps, etc. I buy Gates brand online from RockAuto. Or you can go OEM, which is probably slightly better but Gates is one of the best manufacturers of OEM parts. I think its like $45 or so for a new WP.

Did you actually narrow the leak down to the water pump or just guessing?

[datsik707]

When it comes to timing belts/water pumps, etc. I buy Gates brand online from RockAuto. Or you can go OEM, which is probably slightly better but Gates is one of the best manufacturers of OEM parts. I think its like $45 or so for a new WP.

Did you actually narrow the leak down to the water pump or just guessing?

I seriously doubt it's the weep hole, first pump that went was DUMPING coolant like a ladies water breaking.(Visual enough for ya?)haha

This leak is way slower, so I feel like it's a bad gasket or seal. I won't know s*** until I take her apart. But I hear horrid things of refurbished pumps, my buddy went threw 5 in 3 months in his 240.

[isZ]

I've been dealing with a pesky mysterious leak with my pump as well. Like hours I can't see where its coming from and I've gone through my fair share of oriely auto parts pumps. Today I took my pump off to see where the leak was coming from and found a little spray on the reverse side of the lower tb cover. Leads me to believe the seal is bad or it may be leaking through some of the six w/p bolts. Any clue on if the bolts need rtv silicone to seal water passages etc.... also no visible leaks from shaft or that small hole for pressure relief on the side of the pump and I don't see any streams from the water pipes either. Main guess bolt holes are leaking.....

[datsik707]

I replaced my pump with an actual OEM pump from z1. All fixed