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1999 GTP.. Chugging? Surging?
01-27-2014, 08:22 PM
Post: #1
1999 GTP.. Chugging? Surging?
The other day it was running fine untill i tried to install my new boost gauge from autometer, i ended up breaking vacuum line and after that I didnt drive it, I didnt even turn the car on. After i fixed the vacuum line i turned the car on and started driving it around. Now it seems like it has poor throttle response and when i let off the gas (the fastest ive gone is 25 becuase i never got it out of town) but once i let off the gas to just coast it starts chugging, the RPMs go down to almost 0 and then back up to 1500 or so, the car jumps forward whenever it jumps back up, eventuality after about 30 seconds of that the car just shuts off. Starts just fine and then it does the same thing again..
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01-27-2014, 10:43 PM (This post was last modified: 01-27-2014 10:48 PM by Rupe.)
Post: #2
RE: 1999 GTP.. Chugging? Surging?
Not familiar with this car in particular but if you broke one vac line then I'd say you should replace them all just because they are 15 years old and probably brittle or spongy. Vac lines may be a pain, but they are cheap. They are also a necessary evil on cars these days if you want to keep things running right. Worst case is you spent a few bucks but you might accidentially solve your problem in the process.... and it will be one more thing that doesn't need attention in the near future!

BTW, someone over in the Jeep forum just spent several weekends chassing a similar issue only to find it running perfect after all new vac hoses and a PCV valve. IOW, starting with basics can go a long way at times.

Let us know if this works out as it may help someone else.
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01-28-2014, 10:45 AM
Post: #3
RE: 1999 GTP.. Chugging? Surging?
If you need more help please provide us with the engine size, mileage, std./auto. transmission, and anything else that would give us a better picture of what we are dealing with like... did the Check Engine Light come on? Did you get any codes? What were the code Numbers? Etc.

Thanks for using the forum,
Garner

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01-28-2014, 11:27 AM (This post was last modified: 01-28-2014 11:29 AM by Rupe.)
Post: #4
RE: 1999 GTP.. Chugging? Surging?
Just checking on a few things for your issue and since the supercharged model only came with a 3.8L auto trans combination that narrows things down. What I can tell you is the blower belt must be in place and the boost control safety items must function. IOW, the waste gate and the blow off valve (safety items) must have their vac hoses and wires intact, external linkage must move freely, and no leaks at the gaskets. The other thing is if this car has been sitting around you might want to look around for damage due to critters. Mice and similar animals can chew on anything and also store food / nesting material in the weirdest places. The air filter would be a good place to start your search.

Back to Garner's suggestion of codes in the ECU, it's possible they could tell us something. OTOH, stalling out within 30 seconds may not set it's own code. I would get those codes posted here then clear the memory. Any new codes that show up will be an indication of what's going on. Keep in mind that trying to diagnose things by running the engine with wires and hoses disconnected may set codes unrelated to the original problem, which is why it's a good idea to change ALL of those old vac lines before going further.
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