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Showing results for tags 'rough idle'.
Found 5 results
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I have a 1983 CJ7 with the 258. I have done a home garage restoration. I kept it stock and tried to keep everything oem. The previous owner had installed a rebuilt long block. It had 20000 miles on it when I got it. I basically put everything new on it when I put it back together. It has a non computer controlled nos Carter BBD I found on Ebay. It has a MSD 6al, stock distributor with team rush upgrade. Timing is set at 8°. I have rebuilt the carb twice and adjusted it every which way I can. It idles a little rough. I haven't found any vacuum leaks. I think it should be smoother. I thought it was running rich but now not so sure. The first picture is of my plugs before the last time I adjusted the carb. They are black especially the middle ones. I set the float a little lower hoping to lean it out some. Now my plugs are clean except for a black stripe under the electrode like pictured. I changed them after the adjustment. That's the no 1 plug after around 100 miles. Any suggestions would be appreciated
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I have recently purchased a 90 model with a 2.5 liter engine. I am trying to sort out an idle problem and an engine noise. When I started repairs it idled smooth, though fast 1200rpms First the idle problem. Since getting this I have gone through and replaced a lot of the vacuum lines that were unable to hold vacuum. By following other threads I have been able to determine that my air temperature sensor is broken and my EGR valve is bad, but I am not sure that the system is operating correctly. There is always a little bit of vacuum going to the EGR valve, but when I unplug the solenoid on the passenger fender, it receives 15in of vacuum. Is that correct? Upon removal of the EGR valve I applied vacuum to the valve and it did not hold vacuum or move. The replacement valve I ordered did not move when vacuum was applied but I installed it anyways. Because so many repairs happened at once I am unsure which change affected what, but now the engine is idling at 8-900 rps but roughly. It is surging trying to find where it is supposed to idle. Fingers crossed that when I get another replacement EGR that it will smooth out. Do you have any other things I can look at? The second thing that I wanted to ask was When the engine is warm under cruising light acceleration at medium rpms, 2.5K-3.5k, there is a rattling sound that is coming from the engine. If I snap the throttle open with the hood open, it sounds like it is coming from the top of the engine. Is that just pinging from the bad EGR valve, or is there something possibly mechanically wrong. It does not happen when the engine is cold, only when the engine has been running for 5-10 minutes. Thanks in advance! -
Hello, I have a 1987 YJ 2.5L. It has a bad miss at idle once warmed up. It has a new fuel pump, MAP, Coolant sensor and the mechanic put a used fuel pressure regulator in it. Today, I hooked up my old Snap-on scanner. It shows that it is staying in open loop, it has 0 hg. of manifold vacuum, and coolant is not going over 155 degrees. I changed the coolant sensor and it reads exactly the same. Any thoughts would be greatly appreciated. Tony -
Hi all! I really need some help here. My husband and I are at our wits end. We have a new to us 2000 jeep wrangler, 2.5 manual. Since August when we purchased it we have only been able to drive it maybe 20-25 times. Everytime we have fixed/replaced something on it another problem comes up. So with that being said here's the newest of problems: We have an engine code p0505. Idle air control valve. We have cleaned the throttle body multiple times. Along with the iac sensor. We have replaced the iac sensor 3x with mopar sensors. At idle the engine reads 1000-1200 rpms. While driving the jeep, the rpm is where it's supposed to be. As soon as the clutch is engaged or in neutral the rpm goes all over the place between 700-2000 rpm until we are at a complete stop. Once stopped the rpms sit at 1000-1200 rpms again. Any ideas or suggestions? We're really at a loss here. What we've done:. All hoses have been checked, replaced if needed. O2 sensors replaced with NTK sensors. TPS replaced, crankshaft sensor replaced with mopar. IAC replaced 3x with mopar. Still getting the p0505 code and crazy/high/erratic rpm. Help please! -
Bought my son a nice 86 cherokee. It has an idle problem that is driving me crazy though. I've checked for vacuum leaks and found none. I've checked all the sensors according to what I've found on this site and they check good, except the tps, I havent checked it... I ran out of time the last time I got to work on it due to rain... So it is suspect. The problem is, when you start it, hot or cold, it will surge and sometimes die for about 45 secs to a min. I can see the IAC motor slowing decreasing the idle but then right before it dies, it will snap the throttle open. Somtime's it does die before it can open fast enough, but the IAC motor seems to be working. After that first min of surging, it runs great, won't die or surge again, until you shut it off for a few mins and restart. It will start right up everytime but go through its surge for a min and then run fine. You can keep it running by feathering it. Engine hot or cold it will do this. Could this be the tps? Its the 2.5l with the manual trans.
