Any ideas why rpm tach goes nuts, car instantly dies?
11-21-2018, 08:08 PM
#1
Junior Member
Thread Starter
iTrader: (1)
Join Date: Oct 2018
Posts: 21
Likes: 0
Received 0 Likes
on
0 Posts
Any ideas why rpm tach goes nuts, car instantly dies?
I bought the car recently..bought a new battery, changed the spark plugs/wires, oil change, new oil filter and drained the fuel. Added new fuel. Car see's 45psi on fuel pressure.. When I was under the car I noticed the cats gone and the metal line that ties into the cats is cut and pinched/crimped at end. The car fires over easy..but rpm hiccups and it dies or it just dies immediately or after running 5 mins.. any help is appreciated.
11-21-2018, 08:46 PM
#3
Junior Member
Thread Starter
iTrader: (1)
Join Date: Oct 2018
Posts: 21
Likes: 0
Received 0 Likes
on
0 Posts
Re: Any ideas why rpm tach goes nuts, car instantly dies?
90 iroc z 305 5.0.. tpi.. fires right back up.. but sometimes dies right away immediately.. sometimes tach goes haywire.. stumbles.. then keeps idling or dies
11-21-2018, 09:36 PM
#4
COTM Editor
iTrader: (22)
Join Date: Mar 2001
Posts: 9,928
Likes: 0
Received 1,860 Likes
on
1,274 Posts
Car: '89 Firebird
Engine: 7.0L
Transmission: T56
Re: Any ideas why rpm tach goes nuts, car instantly dies?
I think the tach is operated by the ignition coil, so if the coil goes haywire then maybe the tach would too and the engine would die. Uneducated guess.... I'm no mechanic so don't take my words too seriously.
11-22-2018, 05:54 PM
#6
Junior Member
Thread Starter
iTrader: (1)
Join Date: Oct 2018
Posts: 21
Likes: 0
Received 0 Likes
on
0 Posts
Re: Any ideas why rpm tach goes nuts, car instantly dies?
Ok thanks I'll take a look into it.. i.drove it for the first time today.. and it died and I had to crank it maybe 10 times before it would fire back up..
Trending Topics
11-25-2018, 07:05 PM
#8
Junior Member
Thread Starter
iTrader: (1)
Join Date: Oct 2018
Posts: 21
Likes: 0
Received 0 Likes
on
0 Posts
Re: Any ideas why rpm tach goes nuts, car instantly dies?
I replaced the distributor cap and rotor, ignition control module and ignition coil.. car fired right up.. I drove it 2 miles.. died pulling up to a stoplight.. wouldn't start.. just turn over but not fire.. I'm lost.. fuel pump? Timing? Idk about to save up and take it to a shop.. I'm out of ideas/patience
12-06-2018, 08:29 AM
#11
Member
iTrader: (2)
Join Date: Dec 2012
Location: cape cod ma
Posts: 204
Likes: 0
Received 0 Likes
on
0 Posts
Car: 1988 gta
Engine: 383
Transmission: 700r4
Axle/Gears: 9 bolt 3:23
Re: Any ideas why rpm tach goes nuts, car instantly dies?
Common problem in boats. A bad tack will kill the ignition. Disconnect the tach
03-01-2019, 08:09 AM
#13
Supreme Member
iTrader: (7)
Join Date: May 2004
Location: Lexington, SC
Posts: 5,291
Likes: 0
Received 58 Likes
on
52 Posts
Car: 1987 SC/1985 TA
Engine: 350/vortec/fitech
Transmission: T56
Axle/Gears: 3.27 9-bolt
Re: Any ideas why rpm tach goes nuts, car instantly dies?
Yup
bad pickup coil in the dist will cause the tach to bounce as it misfires and fails.
bad pickup coil in the dist will cause the tach to bounce as it misfires and fails.
Thread
Thread Starter
Forum
Replies
Last Post