Cadillac Repair Questions? Ask a Mechanic for Answers ASAP
Hi im Reggie thanks for using JustAnswer. Put my years of experience and training to work for you
Hello and thanks for giving me the opportunity to help you, ahh the northstar, sometimes i see these in my sleep we have a couple funeral homes and a limo company and i think every one of there limos and hearses are Cadillac chassis. So lets dig right in , you say you put some jb weld on the coolant reservoir was that a crack in the tank? That may be a good patch but that reservoir has got to go. ONe thing if you dont know about these cars is they run to damm hot to start with from the factory the coolant fan does not come on to around 210 215, And the system is rated at 16 psi and it operates under 10 12 psi normally. This is what we have, did you notice i said the fan will not come on to 212? the problem is that is the boiling point of water. Water boils at 212 but put it in a 10psi pressure it goes to 240 15 psi it goes to 250 understanding that you can see why maintaining a properly sealed system is critical. I have put engine after engine in because the owner or there mechanic did not understand the cooling system on these cars. And you may already know by design they have a head sealing problem that is really only corrected by installation of steel thread inserts in block.
Now if i read right your main complaint is the car is skipping in drive and reverse, is that right? Is it running hot at all? Is it losing coolant? And finally does it smooth out above idle in other words once you get it going does it run good? Or do we have a constant dead skip? Do you smell or see anything unusual out exhaust? Is your check engine light on? Can you get a code reader and check for codes and retrieve the misfire data it will have current and history misfires for each cylinder. I want to help you and can but im going to need more information, codes, data in particular misfire for cylinder, short and long term fuel trims, Mass Air flow in gm/s get a reading at idle and then snap the throttle wide open and record highest reading, MAP sensor, coolant and intake air temperature. I look forward to hearing from you.