Search | Car Forums | Gallery | Articles | Helper | AF 350Z | IgorSushko.com | Corporate |
| Latest | 0 Rplys |
|
Show Printable Version | Email this Page | Subscribe to this Thread |
|
Thread Tools |
07-07-2011, 09:45 PM | #1 | |
AF Regular
Join Date: Mar 2006
Location: Winneconne, Wisconsin
Posts: 124
Thanks: 0
Thanked 1 Time in 1 Post
|
Engine Misfiring at Light Loads '93 5.7 Engine
At about 1500 rpm in top gear, at a steady speed, the engine misses causing the car to buck. Switching to D2 or third gear, causes this to go away--rpms are higher in D2.
Any suggestions? I've changed plugs, plug wires, distributor cap, rotor. I do have the initial timing at about twice the recommended setting. There are no codes indicated. |
|
07-08-2011, 03:12 PM | #2 | |
AF Enthusiast
Join Date: Mar 2004
Location: lindsay, Oklahoma
Posts: 794
Thanks: 1
Thanked 40 Times in 39 Posts
|
Re: Engine Misfiring at Light Loads '93 5.7 Engine
Sounds like an overdrive issue. I have a 92 roadmaster, same thing. Mine only does it going up a hill, I just downshift.
I don't know why you have the ignition timing set like that? I guess that is a story for another day. |
|
07-09-2011, 09:51 PM | #3 | |
AF Regular
Thread starter
Join Date: Mar 2006
Location: Winneconne, Wisconsin
Posts: 124
Thanks: 0
Thanked 1 Time in 1 Post
|
Re: Engine Misfiring at Light Loads '93 5.7 Engine
The problem feels like an ignition misfire.
If the timing is set beyond the 6 degree recommended setting, does this cause other problems? I set it this way because with the reman engine, fuel economy has never been as good as the original engine. I used to get 24 mpg highway. Now it's about 20 mpg. |
|
07-10-2011, 09:28 AM | #4 | |
AF Enthusiast
Join Date: Mar 2004
Location: lindsay, Oklahoma
Posts: 794
Thanks: 1
Thanked 40 Times in 39 Posts
|
Re: Engine Misfiring at Light Loads '93 5.7 Engine
Mine is the overdrive, feels like the engine is cutting out. I shift out of od till I gain some speed then back to OD. Always on the same hill, in town, speed limit slows me down.
That timing issue doesn't sound right to me?? |
|
11-09-2011, 02:52 PM | #5 | |
AF Regular
Thread starter
Join Date: Mar 2006
Location: Winneconne, Wisconsin
Posts: 124
Thanks: 0
Thanked 1 Time in 1 Post
|
Re: Engine Misfiring at Light Loads '93 5.7 Engine
I read about a similar problem on another forum related to the EGR valve. I disconnected the EGR and blocked the vacuum line. Problem is gone!!!!
I'm wondering if there are consequences for disabling the EGR. If the only consequence is higher emissions, I'll leave it as is. Car runs perfect! |
|
|
POST REPLY TO THIS THREAD |
|
|